Question:
Which position did Oliver Wittke hold in Jan, 2013?

Context:
 Oliver Wittke holds the position of transport minister from Jun, 2005 to Mar, 2009. 
 Oliver Wittke holds the position of member of the German Bundestag from Oct, 2017 to Apr, 2021. 
 Oliver Wittke holds the position of Parliamentary Secretary in Germany from Mar, 2018 to Nov, 2019. 
 Oliver Wittke holds the position of Lord Mayor from Jan, 1999 to Jan, 2004. 
 Oliver Wittke holds the position of member of the Landtag of North Rhine-Westphalia from May, 2012 to Oct, 2013.

Answer:
member of the Landtag of North Rhine-Westphalia