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: Which of Safin's opponents that he defeated at the 2008 BMW Open was the oldest? Passage:Safin's next tournament was in Valencia. He defeated No. 20-ranked and fourth seed Juan Carlos Ferrero. In spite of the fact that Ferrero is from the Valencia region, Safin was the more popular player, having been based in Valencia for many years and being a well-known Valencia CF fan. – local player Ferrero controversially favouring Real Madrid. He played Dutch teenager Robin Haase in the next round. He won the first set and was up 4–2 in the second set. However, Haase broke back to take it to a tiebreak. Safin had four match points, including one on his serve, but lost the tiebreak, and eventually the match. In the Monte Carlo Masters, Safin defeated Xavier Malisse, but then lost to No. 5 David Ferrer. He then entered the 2008 BMW Open in Munich, Germany, where he beat Carlos Berlocq in the first round. In the second round, he edged out Michael Berrer, but lost to Fernando González in his first quarterfinal of the year, and the first since June 2007 at the Legg Mason Tennis Classic in Washington, D.C. Safin entered the 2008 French Open but was eliminated in the second round by countryman and fourth seed Nikolay Davydenko, in straight sets.


b