Question:
Who was the head of Istanbul in Jan, 2020?

Context:
 Mevlüt Uysal is the head of the government of Istanbul from Sep, 2017 to Apr, 2019. 
 Kadir Topbaş is the head of the government of Istanbul from Apr, 2004 to Sep, 2017. 
 Ekrem İmamoğlu is the head of the government of Istanbul from Apr, 2019 to Dec, 2022.

Answer:
Question:
Who was the head of Istanbul in Jan, 2020?

Context:
 Mevlüt Uysal is the head of the government of Istanbul from Sep, 2017 to Apr, 2019. 
 Kadir Topbaş is the head of the government of Istanbul from Apr, 2004 to Sep, 2017. 
 Ekrem İmamoğlu is the head of the government of Istanbul from Apr, 2019 to Dec, 2022.

Answer:
user
Ekrem İmamoğlu
assistant
Question:
Who was the head of Istanbul in Jan, 2020?

Context:
 Mevlüt Uysal is the head of the government of Istanbul from Sep, 2017 to Apr, 2019. 
 Kadir Topbaş is the head of the government of Istanbul from Apr, 2004 to Sep, 2017. 
 Ekrem İmamoğlu is the head of the government of Istanbul from Apr, 2019 to Dec, 2022.

Answer:
user
Kadir Topbaş
Mevlüt Uysal
assistant
Question:
Who was the head of Istanbul in Jan, 2020?

Context:
 Mevlüt Uysal is the head of the government of Istanbul from Sep, 2017 to Apr, 2019. 
 Kadir Topbaş is the head of the government of Istanbul from Apr, 2004 to Sep, 2017. 
 Ekrem İmamoğlu is the head of the government of Istanbul from Apr, 2019 to Dec, 2022.

Answer:
user
Ekrem İmamoğlu
assistant