Question:
Who was the head of Hagen in May, 2001?

Context:
 Wilfried Horn is the head of the government of Hagen from Jan, 1999 to Jan, 2004. 
 Dietmar Thieser is the head of the government of Hagen from Jan, 1989 to Jan, 1999. 
 Jörg Dehm is the head of the government of Hagen from Jan, 2009 to Jan, 2014. 
 Erik O. Schulz is the head of the government of Hagen from Jan, 2014 to Dec, 2022. 
 Peter Demnitz is the head of the government of Hagen from Jan, 2004 to Jan, 2009.

Answer:
Question:
Who was the head of Hagen in May, 2001?

Context:
 Wilfried Horn is the head of the government of Hagen from Jan, 1999 to Jan, 2004. 
 Dietmar Thieser is the head of the government of Hagen from Jan, 1989 to Jan, 1999. 
 Jörg Dehm is the head of the government of Hagen from Jan, 2009 to Jan, 2014. 
 Erik O. Schulz is the head of the government of Hagen from Jan, 2014 to Dec, 2022. 
 Peter Demnitz is the head of the government of Hagen from Jan, 2004 to Jan, 2009.

Answer:
user
Wilfried Horn
assistant
Question:
Who was the head of Hagen in May, 2001?

Context:
 Wilfried Horn is the head of the government of Hagen from Jan, 1999 to Jan, 2004. 
 Dietmar Thieser is the head of the government of Hagen from Jan, 1989 to Jan, 1999. 
 Jörg Dehm is the head of the government of Hagen from Jan, 2009 to Jan, 2014. 
 Erik O. Schulz is the head of the government of Hagen from Jan, 2014 to Dec, 2022. 
 Peter Demnitz is the head of the government of Hagen from Jan, 2004 to Jan, 2009.

Answer:
user
Jörg Dehm
Dietmar Thieser
Peter Demnitz
Erik O. Schulz
assistant
Question:
Who was the head of Hagen in May, 2001?

Context:
 Wilfried Horn is the head of the government of Hagen from Jan, 1999 to Jan, 2004. 
 Dietmar Thieser is the head of the government of Hagen from Jan, 1989 to Jan, 1999. 
 Jörg Dehm is the head of the government of Hagen from Jan, 2009 to Jan, 2014. 
 Erik O. Schulz is the head of the government of Hagen from Jan, 2014 to Dec, 2022. 
 Peter Demnitz is the head of the government of Hagen from Jan, 2004 to Jan, 2009.

Answer:
user
Wilfried Horn
assistant