Question:
Who was the chair of Unilever in Dec, 2017?

Context:
 Antony Burgmans is the chair of Unilever from May, 2005 to May, 2007. 
 Marijn Dekkers is the chair of Unilever from Apr, 2016 to Nov, 2019. 
 Nils Smedegaard Andersen is the chair of Unilever from Nov, 2019 to Dec, 2022. 
 Michael Treschow is the chair of Unilever from May, 2007 to Apr, 2016.

Answer:
Question:
Who was the chair of Unilever in Dec, 2017?

Context:
 Antony Burgmans is the chair of Unilever from May, 2005 to May, 2007. 
 Marijn Dekkers is the chair of Unilever from Apr, 2016 to Nov, 2019. 
 Nils Smedegaard Andersen is the chair of Unilever from Nov, 2019 to Dec, 2022. 
 Michael Treschow is the chair of Unilever from May, 2007 to Apr, 2016.

Answer:
user
Marijn Dekkers
assistant
Question:
Who was the chair of Unilever in Dec, 2017?

Context:
 Antony Burgmans is the chair of Unilever from May, 2005 to May, 2007. 
 Marijn Dekkers is the chair of Unilever from Apr, 2016 to Nov, 2019. 
 Nils Smedegaard Andersen is the chair of Unilever from Nov, 2019 to Dec, 2022. 
 Michael Treschow is the chair of Unilever from May, 2007 to Apr, 2016.

Answer:
user
Nils Smedegaard Andersen
Antony Burgmans
Michael Treschow
assistant
Question:
Who was the chair of Unilever in Dec, 2017?

Context:
 Antony Burgmans is the chair of Unilever from May, 2005 to May, 2007. 
 Marijn Dekkers is the chair of Unilever from Apr, 2016 to Nov, 2019. 
 Nils Smedegaard Andersen is the chair of Unilever from Nov, 2019 to Dec, 2022. 
 Michael Treschow is the chair of Unilever from May, 2007 to Apr, 2016.

Answer:
user
Marijn Dekkers
assistant