Question:
Who was the head of Ehime Prefecture in Dec, 2005?

Context:
 Sadatake Hisamatsu is the head of the government of Ehime Prefecture from May, 1951 to Jan, 1971. 
 Haruki Shiraishi is the head of the government of Ehime Prefecture from Jan, 1971 to Jan, 1987. 
 Shigetomi Aoki is the head of the government of Ehime Prefecture from Apr, 1947 to Apr, 1951. 
 Moriyuki Kato is the head of the government of Ehime Prefecture from Jan, 1999 to Nov, 2010. 
 Tokihiro Nakamura is the head of the government of Ehime Prefecture from Dec, 2010 to Dec, 2022. 
 Sadayuki Iga is the head of the government of Ehime Prefecture from Jan, 1987 to Jan, 1999.

Answer:
Question:
Who was the head of Ehime Prefecture in Dec, 2005?

Context:
 Sadatake Hisamatsu is the head of the government of Ehime Prefecture from May, 1951 to Jan, 1971. 
 Haruki Shiraishi is the head of the government of Ehime Prefecture from Jan, 1971 to Jan, 1987. 
 Shigetomi Aoki is the head of the government of Ehime Prefecture from Apr, 1947 to Apr, 1951. 
 Moriyuki Kato is the head of the government of Ehime Prefecture from Jan, 1999 to Nov, 2010. 
 Tokihiro Nakamura is the head of the government of Ehime Prefecture from Dec, 2010 to Dec, 2022. 
 Sadayuki Iga is the head of the government of Ehime Prefecture from Jan, 1987 to Jan, 1999.

Answer:
user
Moriyuki Kato
assistant
Question:
Who was the head of Ehime Prefecture in Dec, 2005?

Context:
 Sadatake Hisamatsu is the head of the government of Ehime Prefecture from May, 1951 to Jan, 1971. 
 Haruki Shiraishi is the head of the government of Ehime Prefecture from Jan, 1971 to Jan, 1987. 
 Shigetomi Aoki is the head of the government of Ehime Prefecture from Apr, 1947 to Apr, 1951. 
 Moriyuki Kato is the head of the government of Ehime Prefecture from Jan, 1999 to Nov, 2010. 
 Tokihiro Nakamura is the head of the government of Ehime Prefecture from Dec, 2010 to Dec, 2022. 
 Sadayuki Iga is the head of the government of Ehime Prefecture from Jan, 1987 to Jan, 1999.

Answer:
user
Shigetomi Aoki
Tokihiro Nakamura
Haruki Shiraishi
Sadayuki Iga
Sadatake Hisamatsu
assistant
Question:
Who was the head of Ehime Prefecture in Dec, 2005?

Context:
 Sadatake Hisamatsu is the head of the government of Ehime Prefecture from May, 1951 to Jan, 1971. 
 Haruki Shiraishi is the head of the government of Ehime Prefecture from Jan, 1971 to Jan, 1987. 
 Shigetomi Aoki is the head of the government of Ehime Prefecture from Apr, 1947 to Apr, 1951. 
 Moriyuki Kato is the head of the government of Ehime Prefecture from Jan, 1999 to Nov, 2010. 
 Tokihiro Nakamura is the head of the government of Ehime Prefecture from Dec, 2010 to Dec, 2022. 
 Sadayuki Iga is the head of the government of Ehime Prefecture from Jan, 1987 to Jan, 1999.

Answer:
user
Moriyuki Kato
assistant