Definition: In this task, you're given a question, along with a context passage. The passage will not have a direct answer to the question, but can include some information and a clue for the answer. Assuming you can only obtain information about one entity in the passage, your job is to determine whether information from the passage can be used to answer the question. Indicate your choice as 'a' for Yes or 'b' for No.
Input: Question: What teams won silver and gold in the World League 2011? Passage:In 2011 he was a coach assistant of Poland men's national volleyball team, when a head coach was Andrea Anastasi. In 2011 he won with this national team three medals. On July 10, 2011 achieved bronze of World League 2011. On September 18, 2011 Poland led by Anastasi and Gardini won bronze of European Championship 2011. In the same year, in December his team achieved silver at World Cup 2011 and was qualified for the Olympic Games 2012. For the first time in the history Polish national team won three medals in one year. On July 8, 2012 his team won the final match of World League 2012 against United States (3-0). In 2012 Polish team led by them took the 5th place at the Olympic Games London 2012. In October 2013 Anastasi and Gardini were dismissed as coaches of the Polish national team. On December 22, 2014 he was appointed a new head coach of Polish club Indykpol AZS Olsztyn. In May 2015 he signed a new contract with club from Olsztyn.

Output:
a