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 the people that Jackson competed against in the 2010 World Championships were oldest at the time? Passage:Jackson competed at the 2004 World MTB Orienteering Championships in Ballarat, where he won his first world championship gold medal by winning the sprint, ahead of Alain Berger from Switzerland. He won a bronze medal in the long distance, and a bronze medal with the Australian relay team. At the 2005 World Championships in Banska Bystrica he won a bronze medal in the long distance, placed eighth in the middle distance, and seventh with the Australian relay team. At the 2006 Championships in Joensuu he placed sixth in the long distance and seventh in the middle distance. At the Oceania MTB Orienteering Championships in Victoria, Australia in 2007 he won gold medals in both the sprint, the middle distance and the long distance. At the 2008 World MTB Orienteering Championships in Ostróda, he won a gold medal in the middle distance, placed sixth in the sprint, placed sixth in the long distance, and eleventh in the relay. In Ben Shemen in 2009 he became world champion in both the sprint, ahead of Lasse Brun Pedersen, and in the long distance, ahead of Ruslan Gritsan, and placed fifth in the middle distance. At the 2010 World Championships in Montalegre he won a gold medal in the sprint, ahead of Tõnis Erm, a silver medal in the middle distance behind Samuli Saarela, and a silver medal in the long distance behind Anton Foliforov.


b