Please answer the following question: Information:  - Grenchen is a municipality in the district of Lebern in the canton of Solothurn in Switzerland.  - FC Grenchen is a Swiss football club, based in Grenchen. They currently play in the 1. Liga, and play their matches at the Brühl Stadium.  - Erwin Ballabio ( 20 October 1918 -- 4 March 2008 ) was a Swiss football goalkeeper . He played for FC Grenchen and the Swiss national team . Known as the `` Black Panther '' he kept goal for eight years for the Swiss team .    After reading the paragraphs above, we are interested in knowing the entity with which 'erwin ballabio' exhibits the relationship of 'place of birth'. Find the answer from the choices below.  Choices: - brühl  - canton  - grenchen  - of  - solothurn
Answer:
solothurn