Question:
Who was the head coach of the team FC Bayern Munich in Apr, 2011?

Context:
 Hansi Flick is the head coach of FC Bayern Munich from Nov, 2019 to Jun, 2021. 
 Jürgen Klinsmann is the head coach of FC Bayern Munich from Jan, 2008 to Jan, 2009. 
 Ottmar Hitzfeld is the head coach of FC Bayern Munich from Jan, 2007 to Jan, 2008. 
 Niko Kovač is the head coach of FC Bayern Munich from Jul, 2018 to Nov, 2019. 
 Josep Guardiola is the head coach of FC Bayern Munich from Jun, 2013 to May, 2016. 
 Giovanni Trapattoni is the head coach of FC Bayern Munich from Jul, 1994 to Jun, 1995. 
 Carlo Ancelotti is the head coach of FC Bayern Munich from Jul, 2016 to Sep, 2017. 
 Louis van Gaal is the head coach of FC Bayern Munich from Jul, 2009 to Apr, 2011. 
 Jupp Heynckes is the head coach of FC Bayern Munich from Jul, 1987 to Oct, 1991. 
 Andries Jonker is the head coach of FC Bayern Munich from Apr, 2011 to Jun, 2011. 
 Julian Nagelsmann is the head coach of FC Bayern Munich from Jul, 2021 to Dec, 2022.

Answer:
Andries Jonker