Question:
Who was the head of Saint Petersburg in Dec, 2020?

Context:
 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. 
 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.

Answer:
Question:
Who was the head of Saint Petersburg in Dec, 2020?

Context:
 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. 
 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.

Answer:
user
Alexander Beglov
assistant
Question:
Who was the head of Saint Petersburg in Dec, 2020?

Context:
 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. 
 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.

Answer:
user
Valentina Matviyenko
Vladimir Anatolyevich Yakovlev
Georgy Poltavchenko
Anatoly Sobchak
assistant
Question:
Who was the head of Saint Petersburg in Dec, 2020?

Context:
 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. 
 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.

Answer:
user
Alexander Beglov
assistant