Question:
Who was the chair of Federal Academy for Security Policy in Jun, 2012?

Context:
 Kersten Lahl is the chair of Federal Academy for Security Policy from Jan, 2008 to Aug, 2011. 
 Günter Joetze is the chair of Federal Academy for Security Policy from Jan, 1995 to Jan, 1999. 
 Hans-Dieter Heumann is the chair of Federal Academy for Security Policy from Aug, 2011 to Sep, 2015. 
 Dieter Wellershoff is the chair of Federal Academy for Security Policy from Jan, 1992 to Jan, 1995. 
 Ekkehard Brose is the chair of Federal Academy for Security Policy from Oct, 2019 to Dec, 2022.

Answer:
Question:
Who was the chair of Federal Academy for Security Policy in Jun, 2012?

Context:
 Kersten Lahl is the chair of Federal Academy for Security Policy from Jan, 2008 to Aug, 2011. 
 Günter Joetze is the chair of Federal Academy for Security Policy from Jan, 1995 to Jan, 1999. 
 Hans-Dieter Heumann is the chair of Federal Academy for Security Policy from Aug, 2011 to Sep, 2015. 
 Dieter Wellershoff is the chair of Federal Academy for Security Policy from Jan, 1992 to Jan, 1995. 
 Ekkehard Brose is the chair of Federal Academy for Security Policy from Oct, 2019 to Dec, 2022.

Answer:
user
Hans-Dieter Heumann
assistant
Question:
Who was the chair of Federal Academy for Security Policy in Jun, 2012?

Context:
 Kersten Lahl is the chair of Federal Academy for Security Policy from Jan, 2008 to Aug, 2011. 
 Günter Joetze is the chair of Federal Academy for Security Policy from Jan, 1995 to Jan, 1999. 
 Hans-Dieter Heumann is the chair of Federal Academy for Security Policy from Aug, 2011 to Sep, 2015. 
 Dieter Wellershoff is the chair of Federal Academy for Security Policy from Jan, 1992 to Jan, 1995. 
 Ekkehard Brose is the chair of Federal Academy for Security Policy from Oct, 2019 to Dec, 2022.

Answer:
user
Dieter Wellershoff
Günter Joetze
Kersten Lahl
Ekkehard Brose
assistant
Question:
Who was the chair of Federal Academy for Security Policy in Jun, 2012?

Context:
 Kersten Lahl is the chair of Federal Academy for Security Policy from Jan, 2008 to Aug, 2011. 
 Günter Joetze is the chair of Federal Academy for Security Policy from Jan, 1995 to Jan, 1999. 
 Hans-Dieter Heumann is the chair of Federal Academy for Security Policy from Aug, 2011 to Sep, 2015. 
 Dieter Wellershoff is the chair of Federal Academy for Security Policy from Jan, 1992 to Jan, 1995. 
 Ekkehard Brose is the chair of Federal Academy for Security Policy from Oct, 2019 to Dec, 2022.

Answer:
user
Hans-Dieter Heumann
assistant