Question:
Who was the head of Poland in Oct, 2014?

Context:
 Jan Olszewski is the head of the government of Poland from Dec, 1991 to Jun, 1992. 
 Włodzimierz Cimoszewicz is the head of the government of Poland from Feb, 1996 to Oct, 1997. 
 Waldemar Pawlak is the head of the government of Poland from Oct, 1993 to Mar, 1995. 
 Marek Belka is the head of the government of Poland from May, 2004 to Oct, 2005. 
 Jarosław Kaczyński is the head of the government of Poland from Jul, 2006 to Nov, 2007. 
 Jerzy Buzek is the head of the government of Poland from Oct, 1997 to Oct, 2001. 
 Leszek Miller is the head of the government of Poland from Oct, 2001 to May, 2004. 
 Beata Szydło is the head of the government of Poland from Nov, 2015 to Dec, 2017. 
 Tadeusz Mazowiecki is the head of the government of Poland from Aug, 1989 to Jan, 1991. 
 Józef Oleksy is the head of the government of Poland from Mar, 1995 to Feb, 1996. 
 Ewa Kopacz is the head of the government of Poland from Sep, 2014 to Nov, 2015. 
 Mateusz Morawiecki is the head of the government of Poland from Dec, 2017 to Dec, 2022. 
 Kazimierz Marcinkiewicz is the head of the government of Poland from Oct, 2005 to Jul, 2006. 
 Donald Tusk is the head of the government of Poland from Nov, 2007 to Sep, 2014. 
 Jan Krzysztof Bielecki is the head of the government of Poland from Jan, 1991 to Dec, 1991. 
 Hanna Suchocka is the head of the government of Poland from Jul, 1992 to Oct, 1993.

Answer:
Ewa Kopacz