Question:
Which political party did Paweł Adamowicz belong to in Apr, 2015?

Context:
 Paweł Adamowicz is a member of the independent politician from Jan, 2015 to Jan, 2019. 
 Paweł Adamowicz is a member of the Civic Platform from Jan, 2001 to Jan, 2015. 
 Paweł Adamowicz is a member of the Liberal Democratic Congress from Jan, 1990 to Jan, 1994.

Answer:
independent politician