Question:
Who was the head of Bulgaria in Mar, 2018?

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

Answer:
Question:
Who was the head of Bulgaria in Mar, 2018?

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

Answer:
user
Boyko Borisov
assistant
Question:
Who was the head of Bulgaria in Mar, 2018?

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

Answer:
user
Ognyan Gerdzhikov
Kiril Petkov
assistant
Question:
Who was the head of Bulgaria in Mar, 2018?

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

Answer:
user
Boyko Borisov
assistant