Question:
Who was the chair of West Japan Railway Company in Dec, 2018?

Context:
 Tsutomu Murai is the chair of West Japan Railway Company from Jan, 1987 to Jan, 1992. 
 Tatsuo Tsunoda is the chair of West Japan Railway Company from Jan, 1992 to Jan, 1997. 
 Takayuki Sasaki is the chair of West Japan Railway Company from Jan, 2012 to Jan, 2016. 
 Noritaka Kurauchi is the chair of West Japan Railway Company from Jan, 2006 to Jan, 2012. 
 Seiji Manabe is the chair of West Japan Railway Company from Jan, 2016 to Jun, 2021. 
 Masataka Ide is the chair of West Japan Railway Company from Jan, 1997 to Jan, 2003. 
 Shōjirō Nan'ya is the chair of West Japan Railway Company from Jan, 2003 to Jan, 2006.

Answer:
Question:
Who was the chair of West Japan Railway Company in Dec, 2018?

Context:
 Tsutomu Murai is the chair of West Japan Railway Company from Jan, 1987 to Jan, 1992. 
 Tatsuo Tsunoda is the chair of West Japan Railway Company from Jan, 1992 to Jan, 1997. 
 Takayuki Sasaki is the chair of West Japan Railway Company from Jan, 2012 to Jan, 2016. 
 Noritaka Kurauchi is the chair of West Japan Railway Company from Jan, 2006 to Jan, 2012. 
 Seiji Manabe is the chair of West Japan Railway Company from Jan, 2016 to Jun, 2021. 
 Masataka Ide is the chair of West Japan Railway Company from Jan, 1997 to Jan, 2003. 
 Shōjirō Nan'ya is the chair of West Japan Railway Company from Jan, 2003 to Jan, 2006.

Answer:
user
Seiji Manabe
assistant
Question:
Who was the chair of West Japan Railway Company in Dec, 2018?

Context:
 Tsutomu Murai is the chair of West Japan Railway Company from Jan, 1987 to Jan, 1992. 
 Tatsuo Tsunoda is the chair of West Japan Railway Company from Jan, 1992 to Jan, 1997. 
 Takayuki Sasaki is the chair of West Japan Railway Company from Jan, 2012 to Jan, 2016. 
 Noritaka Kurauchi is the chair of West Japan Railway Company from Jan, 2006 to Jan, 2012. 
 Seiji Manabe is the chair of West Japan Railway Company from Jan, 2016 to Jun, 2021. 
 Masataka Ide is the chair of West Japan Railway Company from Jan, 1997 to Jan, 2003. 
 Shōjirō Nan'ya is the chair of West Japan Railway Company from Jan, 2003 to Jan, 2006.

Answer:
user
Masataka Ide
Noritaka Kurauchi
Shōjirō Nan'ya
Takayuki Sasaki
Tsutomu Murai
Tatsuo Tsunoda
assistant
Question:
Who was the chair of West Japan Railway Company in Dec, 2018?

Context:
 Tsutomu Murai is the chair of West Japan Railway Company from Jan, 1987 to Jan, 1992. 
 Tatsuo Tsunoda is the chair of West Japan Railway Company from Jan, 1992 to Jan, 1997. 
 Takayuki Sasaki is the chair of West Japan Railway Company from Jan, 2012 to Jan, 2016. 
 Noritaka Kurauchi is the chair of West Japan Railway Company from Jan, 2006 to Jan, 2012. 
 Seiji Manabe is the chair of West Japan Railway Company from Jan, 2016 to Jun, 2021. 
 Masataka Ide is the chair of West Japan Railway Company from Jan, 1997 to Jan, 2003. 
 Shōjirō Nan'ya is the chair of West Japan Railway Company from Jan, 2003 to Jan, 2006.

Answer:
user
Seiji Manabe
assistant