Question:
Who was the head of Saint Petersburg in Oct, 2015?

Context:
 Anatoly Sobchak is the head of the government of Saint Petersburg from Jan, 1991 to Jan, 1996. 
 Valentina Matviyenko is the head of the government of Saint Petersburg from Jan, 2003 to Jan, 2011. 
 Vladimir Anatolyevich Yakovlev is the head of the government of Saint Petersburg from Jan, 1996 to Jan, 2003. 
 Georgy Poltavchenko is the head of the government of Saint Petersburg from Jan, 2011 to Jan, 2018. 
 Alexander Beglov is the head of the government of Saint Petersburg from Jan, 2018 to Dec, 2022.

Answer:
Question:
Who was the head of Saint Petersburg in Oct, 2015?

Context:
 Anatoly Sobchak is the head of the government of Saint Petersburg from Jan, 1991 to Jan, 1996. 
 Valentina Matviyenko is the head of the government of Saint Petersburg from Jan, 2003 to Jan, 2011. 
 Vladimir Anatolyevich Yakovlev is the head of the government of Saint Petersburg from Jan, 1996 to Jan, 2003. 
 Georgy Poltavchenko is the head of the government of Saint Petersburg from Jan, 2011 to Jan, 2018. 
 Alexander Beglov is the head of the government of Saint Petersburg from Jan, 2018 to Dec, 2022.

Answer:
user
Georgy Poltavchenko
assistant
Question:
Who was the head of Saint Petersburg in Oct, 2015?

Context:
 Anatoly Sobchak is the head of the government of Saint Petersburg from Jan, 1991 to Jan, 1996. 
 Valentina Matviyenko is the head of the government of Saint Petersburg from Jan, 2003 to Jan, 2011. 
 Vladimir Anatolyevich Yakovlev is the head of the government of Saint Petersburg from Jan, 1996 to Jan, 2003. 
 Georgy Poltavchenko is the head of the government of Saint Petersburg from Jan, 2011 to Jan, 2018. 
 Alexander Beglov is the head of the government of Saint Petersburg from Jan, 2018 to Dec, 2022.

Answer:
user
Valentina Matviyenko
Vladimir Anatolyevich Yakovlev
Alexander Beglov
Anatoly Sobchak
assistant
Question:
Who was the head of Saint Petersburg in Oct, 2015?

Context:
 Anatoly Sobchak is the head of the government of Saint Petersburg from Jan, 1991 to Jan, 1996. 
 Valentina Matviyenko is the head of the government of Saint Petersburg from Jan, 2003 to Jan, 2011. 
 Vladimir Anatolyevich Yakovlev is the head of the government of Saint Petersburg from Jan, 1996 to Jan, 2003. 
 Georgy Poltavchenko is the head of the government of Saint Petersburg from Jan, 2011 to Jan, 2018. 
 Alexander Beglov is the head of the government of Saint Petersburg from Jan, 2018 to Dec, 2022.

Answer:
user
Georgy Poltavchenko
assistant