15437
Wintershall  based in  Kassel  Germany is a wholly owned subsidiary of BASF SE in Ludwigshafen .
 city of headquarters: Wintershall, Kassel
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: cities of residence, top members employees, members, alternate names, origin, state or provinces of residence, title of person, spouse, city of headquarters, NA, founded by, state or province of headquarters, employee of, countries of residence, country of birth, founded, subsidiaries, country of headquarters 
Text: {0} 
 Entity Pairs:  Wintershall, Kassel 
Answer:
 city of headquarters: Wintershall, Kassel