Question:
Who was the chair of United States Department of the Interior in Apr, 2018?

Context:
 David L. Bernhardt is the chair of United States Department of the Interior from Apr, 2019 to Jan, 2021. 
 Deb Haaland is the chair of United States Department of the Interior from Mar, 2021 to Dec, 2022. 
 Sally Jewell is the chair of United States Department of the Interior from Apr, 2013 to Jan, 2017. 
 Ryan Zinke is the chair of United States Department of the Interior from Mar, 2017 to Jan, 2019.

Answer:
Question:
Who was the chair of United States Department of the Interior in Apr, 2018?

Context:
 David L. Bernhardt is the chair of United States Department of the Interior from Apr, 2019 to Jan, 2021. 
 Deb Haaland is the chair of United States Department of the Interior from Mar, 2021 to Dec, 2022. 
 Sally Jewell is the chair of United States Department of the Interior from Apr, 2013 to Jan, 2017. 
 Ryan Zinke is the chair of United States Department of the Interior from Mar, 2017 to Jan, 2019.

Answer:
user
Ryan Zinke
assistant
Question:
Who was the chair of United States Department of the Interior in Apr, 2018?

Context:
 David L. Bernhardt is the chair of United States Department of the Interior from Apr, 2019 to Jan, 2021. 
 Deb Haaland is the chair of United States Department of the Interior from Mar, 2021 to Dec, 2022. 
 Sally Jewell is the chair of United States Department of the Interior from Apr, 2013 to Jan, 2017. 
 Ryan Zinke is the chair of United States Department of the Interior from Mar, 2017 to Jan, 2019.

Answer:
user
David L. Bernhardt
Sally Jewell
Deb Haaland
assistant
Question:
Who was the chair of United States Department of the Interior in Apr, 2018?

Context:
 David L. Bernhardt is the chair of United States Department of the Interior from Apr, 2019 to Jan, 2021. 
 Deb Haaland is the chair of United States Department of the Interior from Mar, 2021 to Dec, 2022. 
 Sally Jewell is the chair of United States Department of the Interior from Apr, 2013 to Jan, 2017. 
 Ryan Zinke is the chair of United States Department of the Interior from Mar, 2017 to Jan, 2019.

Answer:
user
Ryan Zinke
assistant