Question:
Who was the head of state of Guyana in Apr, 2015?

Context:
 Irfaan Ali is the head of the state of Guyana from Aug, 2020 to Dec, 2022. 
 David A. Granger is the head of the state of Guyana from May, 2015 to Aug, 2020. 
 Donald Ramotar is the head of the state of Guyana from Dec, 2011 to May, 2015.

Answer:
Question:
Who was the head of state of Guyana in Apr, 2015?

Context:
 Irfaan Ali is the head of the state of Guyana from Aug, 2020 to Dec, 2022. 
 David A. Granger is the head of the state of Guyana from May, 2015 to Aug, 2020. 
 Donald Ramotar is the head of the state of Guyana from Dec, 2011 to May, 2015.

Answer:
user
Donald Ramotar
assistant
Question:
Who was the head of state of Guyana in Apr, 2015?

Context:
 Irfaan Ali is the head of the state of Guyana from Aug, 2020 to Dec, 2022. 
 David A. Granger is the head of the state of Guyana from May, 2015 to Aug, 2020. 
 Donald Ramotar is the head of the state of Guyana from Dec, 2011 to May, 2015.

Answer:
user
David A. Granger
Irfaan Ali
assistant
Question:
Who was the head of state of Guyana in Apr, 2015?

Context:
 Irfaan Ali is the head of the state of Guyana from Aug, 2020 to Dec, 2022. 
 David A. Granger is the head of the state of Guyana from May, 2015 to Aug, 2020. 
 Donald Ramotar is the head of the state of Guyana from Dec, 2011 to May, 2015.

Answer:
user
Donald Ramotar
assistant