Question:
Who was the head of state of Taiwan in Mar, 1928?

Context:
 Chiang Ching-kuo is the head of the state of Taiwan from May, 1978 to Jan, 1988. 
 Yan Xishan is the head of the state of Taiwan from Jan, 1949 to Mar, 1950. 
 Lee Teng-hui is the head of the state of Taiwan from Jan, 1988 to May, 2000. 
 Hu Weide is the head of the state of Taiwan from Apr, 1926 to May, 1926. 
 Duan Qirui is the head of the state of Taiwan from Nov, 1924 to Apr, 1926. 
 Yuan Shikai is the head of the state of Taiwan from Mar, 1912 to Jun, 1916. 
 Yen Chia-kan is the head of the state of Taiwan from Apr, 1975 to May, 1978. 
 Chiang Kai-shek is the head of the state of Taiwan from Oct, 1928 to Dec, 1931. 
 Tsai Ing-wen is the head of the state of Taiwan from May, 2016 to Dec, 2022. 
 Li Zongren is the head of the state of Taiwan from Jan, 1949 to Mar, 1950. 
 Zhou Ziqi is the head of the state of Taiwan from Jun, 1922 to Jun, 1922. 
 Wellington Koo is the head of the state of Taiwan from Oct, 1926 to Jun, 1927. 
 Tan Yankai is the head of the state of Taiwan from Feb, 1928 to Oct, 1928. 
 Zhang Zuolin is the head of the state of Taiwan from Jun, 1927 to Jun, 1928. 
 Sun Yat-sen is the head of the state of Taiwan from Jan, 1912 to Mar, 1912. 
 Yan Huiqing is the head of the state of Taiwan from May, 1926 to Jun, 1926. 
 Du Xigui is the head of the state of Taiwan from Jun, 1926 to Oct, 1926. 
 Ma Ying-jeou is the head of the state of Taiwan from May, 2008 to May, 2016. 
 Chen Shui-bian is the head of the state of Taiwan from May, 2000 to May, 2008.

Answer:
Question:
Who was the head of state of Taiwan in Mar, 1928?

Context:
 Chiang Ching-kuo is the head of the state of Taiwan from May, 1978 to Jan, 1988. 
 Yan Xishan is the head of the state of Taiwan from Jan, 1949 to Mar, 1950. 
 Lee Teng-hui is the head of the state of Taiwan from Jan, 1988 to May, 2000. 
 Hu Weide is the head of the state of Taiwan from Apr, 1926 to May, 1926. 
 Duan Qirui is the head of the state of Taiwan from Nov, 1924 to Apr, 1926. 
 Yuan Shikai is the head of the state of Taiwan from Mar, 1912 to Jun, 1916. 
 Yen Chia-kan is the head of the state of Taiwan from Apr, 1975 to May, 1978. 
 Chiang Kai-shek is the head of the state of Taiwan from Oct, 1928 to Dec, 1931. 
 Tsai Ing-wen is the head of the state of Taiwan from May, 2016 to Dec, 2022. 
 Li Zongren is the head of the state of Taiwan from Jan, 1949 to Mar, 1950. 
 Zhou Ziqi is the head of the state of Taiwan from Jun, 1922 to Jun, 1922. 
 Wellington Koo is the head of the state of Taiwan from Oct, 1926 to Jun, 1927. 
 Tan Yankai is the head of the state of Taiwan from Feb, 1928 to Oct, 1928. 
 Zhang Zuolin is the head of the state of Taiwan from Jun, 1927 to Jun, 1928. 
 Sun Yat-sen is the head of the state of Taiwan from Jan, 1912 to Mar, 1912. 
 Yan Huiqing is the head of the state of Taiwan from May, 1926 to Jun, 1926. 
 Du Xigui is the head of the state of Taiwan from Jun, 1926 to Oct, 1926. 
 Ma Ying-jeou is the head of the state of Taiwan from May, 2008 to May, 2016. 
 Chen Shui-bian is the head of the state of Taiwan from May, 2000 to May, 2008.

Answer:
user
Tan Yankai
assistant
Question:
Who was the head of state of Taiwan in Mar, 1928?

Context:
 Chiang Ching-kuo is the head of the state of Taiwan from May, 1978 to Jan, 1988. 
 Yan Xishan is the head of the state of Taiwan from Jan, 1949 to Mar, 1950. 
 Lee Teng-hui is the head of the state of Taiwan from Jan, 1988 to May, 2000. 
 Hu Weide is the head of the state of Taiwan from Apr, 1926 to May, 1926. 
 Duan Qirui is the head of the state of Taiwan from Nov, 1924 to Apr, 1926. 
 Yuan Shikai is the head of the state of Taiwan from Mar, 1912 to Jun, 1916. 
 Yen Chia-kan is the head of the state of Taiwan from Apr, 1975 to May, 1978. 
 Chiang Kai-shek is the head of the state of Taiwan from Oct, 1928 to Dec, 1931. 
 Tsai Ing-wen is the head of the state of Taiwan from May, 2016 to Dec, 2022. 
 Li Zongren is the head of the state of Taiwan from Jan, 1949 to Mar, 1950. 
 Zhou Ziqi is the head of the state of Taiwan from Jun, 1922 to Jun, 1922. 
 Wellington Koo is the head of the state of Taiwan from Oct, 1926 to Jun, 1927. 
 Tan Yankai is the head of the state of Taiwan from Feb, 1928 to Oct, 1928. 
 Zhang Zuolin is the head of the state of Taiwan from Jun, 1927 to Jun, 1928. 
 Sun Yat-sen is the head of the state of Taiwan from Jan, 1912 to Mar, 1912. 
 Yan Huiqing is the head of the state of Taiwan from May, 1926 to Jun, 1926. 
 Du Xigui is the head of the state of Taiwan from Jun, 1926 to Oct, 1926. 
 Ma Ying-jeou is the head of the state of Taiwan from May, 2008 to May, 2016. 
 Chen Shui-bian is the head of the state of Taiwan from May, 2000 to May, 2008.

Answer:
user
Chiang Ching-kuo
Yuan Shikai
Zhou Ziqi
Hu Weide
Ma Ying-jeou
Sun Yat-sen
Lee Teng-hui
Duan Qirui
Yan Xishan
Yan Huiqing
Chen Shui-bian
Du Xigui
Wellington Koo
Li Zongren
Yen Chia-kan
Tsai Ing-wen
Chiang Kai-shek
assistant
Question:
Who was the head of state of Taiwan in Mar, 1928?

Context:
 Chiang Ching-kuo is the head of the state of Taiwan from May, 1978 to Jan, 1988. 
 Yan Xishan is the head of the state of Taiwan from Jan, 1949 to Mar, 1950. 
 Lee Teng-hui is the head of the state of Taiwan from Jan, 1988 to May, 2000. 
 Hu Weide is the head of the state of Taiwan from Apr, 1926 to May, 1926. 
 Duan Qirui is the head of the state of Taiwan from Nov, 1924 to Apr, 1926. 
 Yuan Shikai is the head of the state of Taiwan from Mar, 1912 to Jun, 1916. 
 Yen Chia-kan is the head of the state of Taiwan from Apr, 1975 to May, 1978. 
 Chiang Kai-shek is the head of the state of Taiwan from Oct, 1928 to Dec, 1931. 
 Tsai Ing-wen is the head of the state of Taiwan from May, 2016 to Dec, 2022. 
 Li Zongren is the head of the state of Taiwan from Jan, 1949 to Mar, 1950. 
 Zhou Ziqi is the head of the state of Taiwan from Jun, 1922 to Jun, 1922. 
 Wellington Koo is the head of the state of Taiwan from Oct, 1926 to Jun, 1927. 
 Tan Yankai is the head of the state of Taiwan from Feb, 1928 to Oct, 1928. 
 Zhang Zuolin is the head of the state of Taiwan from Jun, 1927 to Jun, 1928. 
 Sun Yat-sen is the head of the state of Taiwan from Jan, 1912 to Mar, 1912. 
 Yan Huiqing is the head of the state of Taiwan from May, 1926 to Jun, 1926. 
 Du Xigui is the head of the state of Taiwan from Jun, 1926 to Oct, 1926. 
 Ma Ying-jeou is the head of the state of Taiwan from May, 2008 to May, 2016. 
 Chen Shui-bian is the head of the state of Taiwan from May, 2000 to May, 2008.

Answer:
user
Tan Yankai
assistant