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 year did Sharif become Prime Minister? Passage:His credential and reputation eventually led him secure nomination for the presidency by Prime Minister Benazir Bhutto and elected as President in 1993. However, he began receiving criticism over the controversial appointments of Senior Justices of the Supreme Court of Pakistan and was implicated in Mehran Bank scandal. Differences began to emerge with Prime Minister Benazir Bhutto on policy issues in 1995 and he surprisingly dismissed his leader's government in 1996. His political ambitions later clashed with Prime Minister Nawaz Sharif and his intervention to retain Justice Sajjad Ali Shah as Chief Justice finally led to his resignation in 1997. He remained active in politics and joined the PML(Q) in 2004. Leghari died from a long heart illness at the Combined Military Hospital in Rawalpindi on 20 October 2010.


b