Question:
Who was the head of Aachen in Jan, 2007?

Context:
 Marcel Philipp is the head of the government of Aachen from Oct, 2009 to Nov, 2020. 
 Albert Maas is the head of the government of Aachen from Jan, 1946 to Jan, 1952. 
 Sibylle Keupen is the head of the government of Aachen from Nov, 2020 to Dec, 2022. 
 Hermann Heusch is the head of the government of Aachen from Jan, 1952 to Jan, 1973. 
 Jürgen Linden is the head of the government of Aachen from Oct, 1989 to Oct, 2009. 
 Kurt Malangré is the head of the government of Aachen from Jan, 1973 to Oct, 1989.

Answer:
Question:
Who was the head of Aachen in Jan, 2007?

Context:
 Marcel Philipp is the head of the government of Aachen from Oct, 2009 to Nov, 2020. 
 Albert Maas is the head of the government of Aachen from Jan, 1946 to Jan, 1952. 
 Sibylle Keupen is the head of the government of Aachen from Nov, 2020 to Dec, 2022. 
 Hermann Heusch is the head of the government of Aachen from Jan, 1952 to Jan, 1973. 
 Jürgen Linden is the head of the government of Aachen from Oct, 1989 to Oct, 2009. 
 Kurt Malangré is the head of the government of Aachen from Jan, 1973 to Oct, 1989.

Answer:
user
Jürgen Linden
assistant
Question:
Who was the head of Aachen in Jan, 2007?

Context:
 Marcel Philipp is the head of the government of Aachen from Oct, 2009 to Nov, 2020. 
 Albert Maas is the head of the government of Aachen from Jan, 1946 to Jan, 1952. 
 Sibylle Keupen is the head of the government of Aachen from Nov, 2020 to Dec, 2022. 
 Hermann Heusch is the head of the government of Aachen from Jan, 1952 to Jan, 1973. 
 Jürgen Linden is the head of the government of Aachen from Oct, 1989 to Oct, 2009. 
 Kurt Malangré is the head of the government of Aachen from Jan, 1973 to Oct, 1989.

Answer:
user
Sibylle Keupen
Albert Maas
Marcel Philipp
Kurt Malangré
Hermann Heusch
assistant
Question:
Who was the head of Aachen in Jan, 2007?

Context:
 Marcel Philipp is the head of the government of Aachen from Oct, 2009 to Nov, 2020. 
 Albert Maas is the head of the government of Aachen from Jan, 1946 to Jan, 1952. 
 Sibylle Keupen is the head of the government of Aachen from Nov, 2020 to Dec, 2022. 
 Hermann Heusch is the head of the government of Aachen from Jan, 1952 to Jan, 1973. 
 Jürgen Linden is the head of the government of Aachen from Oct, 1989 to Oct, 2009. 
 Kurt Malangré is the head of the government of Aachen from Jan, 1973 to Oct, 1989.

Answer:
user
Jürgen Linden
assistant