Question:
Who was the chair of Naturschutzbund Deutschland in Jul, 1989?

Context:
 Jörg-Andreas Krüger is the chair of Naturschutzbund Deutschland from Nov, 2019 to Dec, 2022. 
 Klaus Dürkop is the chair of Naturschutzbund Deutschland from Jan, 1988 to Jan, 1992. 
 Hans Scholten is the chair of Naturschutzbund Deutschland from Jan, 1984 to Jan, 1988. 
 Sebastian Pfeifer is the chair of Naturschutzbund Deutschland from Jan, 1966 to Jan, 1969. 
 Jochen Flasbarth is the chair of Naturschutzbund Deutschland from Jan, 1992 to Jan, 2003. 
 Olaf Tschimpke is the chair of Naturschutzbund Deutschland from Jun, 2003 to Nov, 2019. 
 Berndt Heydemann is the chair of Naturschutzbund Deutschland from Jan, 1984 to Nov, 1984. 
 Claus König is the chair of Naturschutzbund Deutschland from Jan, 1969 to Jan, 1984.

Answer:
Question:
Who was the chair of Naturschutzbund Deutschland in Jul, 1989?

Context:
 Jörg-Andreas Krüger is the chair of Naturschutzbund Deutschland from Nov, 2019 to Dec, 2022. 
 Klaus Dürkop is the chair of Naturschutzbund Deutschland from Jan, 1988 to Jan, 1992. 
 Hans Scholten is the chair of Naturschutzbund Deutschland from Jan, 1984 to Jan, 1988. 
 Sebastian Pfeifer is the chair of Naturschutzbund Deutschland from Jan, 1966 to Jan, 1969. 
 Jochen Flasbarth is the chair of Naturschutzbund Deutschland from Jan, 1992 to Jan, 2003. 
 Olaf Tschimpke is the chair of Naturschutzbund Deutschland from Jun, 2003 to Nov, 2019. 
 Berndt Heydemann is the chair of Naturschutzbund Deutschland from Jan, 1984 to Nov, 1984. 
 Claus König is the chair of Naturschutzbund Deutschland from Jan, 1969 to Jan, 1984.

Answer:
user
Klaus Dürkop
assistant
Question:
Who was the chair of Naturschutzbund Deutschland in Jul, 1989?

Context:
 Jörg-Andreas Krüger is the chair of Naturschutzbund Deutschland from Nov, 2019 to Dec, 2022. 
 Klaus Dürkop is the chair of Naturschutzbund Deutschland from Jan, 1988 to Jan, 1992. 
 Hans Scholten is the chair of Naturschutzbund Deutschland from Jan, 1984 to Jan, 1988. 
 Sebastian Pfeifer is the chair of Naturschutzbund Deutschland from Jan, 1966 to Jan, 1969. 
 Jochen Flasbarth is the chair of Naturschutzbund Deutschland from Jan, 1992 to Jan, 2003. 
 Olaf Tschimpke is the chair of Naturschutzbund Deutschland from Jun, 2003 to Nov, 2019. 
 Berndt Heydemann is the chair of Naturschutzbund Deutschland from Jan, 1984 to Nov, 1984. 
 Claus König is the chair of Naturschutzbund Deutschland from Jan, 1969 to Jan, 1984.

Answer:
user
Jochen Flasbarth
Berndt Heydemann
Sebastian Pfeifer
Claus König
Olaf Tschimpke
Jörg-Andreas Krüger
Hans Scholten
assistant
Question:
Who was the chair of Naturschutzbund Deutschland in Jul, 1989?

Context:
 Jörg-Andreas Krüger is the chair of Naturschutzbund Deutschland from Nov, 2019 to Dec, 2022. 
 Klaus Dürkop is the chair of Naturschutzbund Deutschland from Jan, 1988 to Jan, 1992. 
 Hans Scholten is the chair of Naturschutzbund Deutschland from Jan, 1984 to Jan, 1988. 
 Sebastian Pfeifer is the chair of Naturschutzbund Deutschland from Jan, 1966 to Jan, 1969. 
 Jochen Flasbarth is the chair of Naturschutzbund Deutschland from Jan, 1992 to Jan, 2003. 
 Olaf Tschimpke is the chair of Naturschutzbund Deutschland from Jun, 2003 to Nov, 2019. 
 Berndt Heydemann is the chair of Naturschutzbund Deutschland from Jan, 1984 to Nov, 1984. 
 Claus König is the chair of Naturschutzbund Deutschland from Jan, 1969 to Jan, 1984.

Answer:
user
Klaus Dürkop
assistant