Question:
Who was the head of Ukraine in Dec, 2007?

Context:
 Yulia Tymoshenko is the head of the government of Ukraine from Mar, 2010 to Mar, 2010. 
 Viktor Yanukovych is the head of the government of Ukraine from Nov, 2007 to Dec, 2007. 
 Pavlo Lazarenko is the head of the government of Ukraine from May, 1996 to Jun, 1997. 
 Oleksiy Honcharuk is the head of the government of Ukraine from Aug, 2019 to Mar, 2020. 
 Denys Shmyhal is the head of the government of Ukraine from Mar, 2020 to Dec, 2022. 
 Volodymyr Groysman is the head of the government of Ukraine from Apr, 2016 to Aug, 2019. 
 Mykola Azarov is the head of the government of Ukraine from Mar, 2010 to Jan, 2014. 
 Arseniy Yatsenyuk is the head of the government of Ukraine from Feb, 2014 to Apr, 2016. 
 Serhiy Arbuzov is the head of the government of Ukraine from Jan, 2014 to Feb, 2014. 
 Yuriy Yekhanurov is the head of the government of Ukraine from May, 2006 to Aug, 2006.

Answer:
Question:
Who was the head of Ukraine in Dec, 2007?

Context:
 Yulia Tymoshenko is the head of the government of Ukraine from Mar, 2010 to Mar, 2010. 
 Viktor Yanukovych is the head of the government of Ukraine from Nov, 2007 to Dec, 2007. 
 Pavlo Lazarenko is the head of the government of Ukraine from May, 1996 to Jun, 1997. 
 Oleksiy Honcharuk is the head of the government of Ukraine from Aug, 2019 to Mar, 2020. 
 Denys Shmyhal is the head of the government of Ukraine from Mar, 2020 to Dec, 2022. 
 Volodymyr Groysman is the head of the government of Ukraine from Apr, 2016 to Aug, 2019. 
 Mykola Azarov is the head of the government of Ukraine from Mar, 2010 to Jan, 2014. 
 Arseniy Yatsenyuk is the head of the government of Ukraine from Feb, 2014 to Apr, 2016. 
 Serhiy Arbuzov is the head of the government of Ukraine from Jan, 2014 to Feb, 2014. 
 Yuriy Yekhanurov is the head of the government of Ukraine from May, 2006 to Aug, 2006.

Answer:
user
Viktor Yanukovych
assistant
Question:
Who was the head of Ukraine in Dec, 2007?

Context:
 Yulia Tymoshenko is the head of the government of Ukraine from Mar, 2010 to Mar, 2010. 
 Viktor Yanukovych is the head of the government of Ukraine from Nov, 2007 to Dec, 2007. 
 Pavlo Lazarenko is the head of the government of Ukraine from May, 1996 to Jun, 1997. 
 Oleksiy Honcharuk is the head of the government of Ukraine from Aug, 2019 to Mar, 2020. 
 Denys Shmyhal is the head of the government of Ukraine from Mar, 2020 to Dec, 2022. 
 Volodymyr Groysman is the head of the government of Ukraine from Apr, 2016 to Aug, 2019. 
 Mykola Azarov is the head of the government of Ukraine from Mar, 2010 to Jan, 2014. 
 Arseniy Yatsenyuk is the head of the government of Ukraine from Feb, 2014 to Apr, 2016. 
 Serhiy Arbuzov is the head of the government of Ukraine from Jan, 2014 to Feb, 2014. 
 Yuriy Yekhanurov is the head of the government of Ukraine from May, 2006 to Aug, 2006.

Answer:
user
Yulia Tymoshenko
Oleksiy Honcharuk
Volodymyr Groysman
Denys Shmyhal
Mykola Azarov
Yuriy Yekhanurov
Arseniy Yatsenyuk
Serhiy Arbuzov
Pavlo Lazarenko
assistant
Question:
Who was the head of Ukraine in Dec, 2007?

Context:
 Yulia Tymoshenko is the head of the government of Ukraine from Mar, 2010 to Mar, 2010. 
 Viktor Yanukovych is the head of the government of Ukraine from Nov, 2007 to Dec, 2007. 
 Pavlo Lazarenko is the head of the government of Ukraine from May, 1996 to Jun, 1997. 
 Oleksiy Honcharuk is the head of the government of Ukraine from Aug, 2019 to Mar, 2020. 
 Denys Shmyhal is the head of the government of Ukraine from Mar, 2020 to Dec, 2022. 
 Volodymyr Groysman is the head of the government of Ukraine from Apr, 2016 to Aug, 2019. 
 Mykola Azarov is the head of the government of Ukraine from Mar, 2010 to Jan, 2014. 
 Arseniy Yatsenyuk is the head of the government of Ukraine from Feb, 2014 to Apr, 2016. 
 Serhiy Arbuzov is the head of the government of Ukraine from Jan, 2014 to Feb, 2014. 
 Yuriy Yekhanurov is the head of the government of Ukraine from May, 2006 to Aug, 2006.

Answer:
user
Viktor Yanukovych
assistant