Question:
Who was the head of Bulgaria in Apr, 2017?

Context:
 Boyko Borisov is the head of the government of Bulgaria from May, 2017 to May, 2021. 
 Kiril Petkov is the head of the government of Bulgaria from Dec, 2021 to Dec, 2022. 
 Ognyan Gerdzhikov is the head of the government of Bulgaria from Jan, 2017 to May, 2017.

Answer:
Question:
Who was the head of Bulgaria in Apr, 2017?

Context:
 Boyko Borisov is the head of the government of Bulgaria from May, 2017 to May, 2021. 
 Kiril Petkov is the head of the government of Bulgaria from Dec, 2021 to Dec, 2022. 
 Ognyan Gerdzhikov is the head of the government of Bulgaria from Jan, 2017 to May, 2017.

Answer:
user
Ognyan Gerdzhikov
assistant
Question:
Who was the head of Bulgaria in Apr, 2017?

Context:
 Boyko Borisov is the head of the government of Bulgaria from May, 2017 to May, 2021. 
 Kiril Petkov is the head of the government of Bulgaria from Dec, 2021 to Dec, 2022. 
 Ognyan Gerdzhikov is the head of the government of Bulgaria from Jan, 2017 to May, 2017.

Answer:
user
Kiril Petkov
Boyko Borisov
assistant
Question:
Who was the head of Bulgaria in Apr, 2017?

Context:
 Boyko Borisov is the head of the government of Bulgaria from May, 2017 to May, 2021. 
 Kiril Petkov is the head of the government of Bulgaria from Dec, 2021 to Dec, 2022. 
 Ognyan Gerdzhikov is the head of the government of Bulgaria from Jan, 2017 to May, 2017.

Answer:
user
Ognyan Gerdzhikov
assistant