Q: 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.
Question: How old was Claudius at the start of the first book? Passage:The Eagles of the Empire series centres upon two main protagonists, Quintus Licinius Cato and Lucius Cornelius Macro, who are both Roman soldiers. Macro, a veteran with nearly 15 years' service (at the start of the first novel) in the Roman Army, has recently been appointed to the Centurionate. Cato is in his teen years, grew up in the Imperial Palace as a slave, and at the start of the series joins the Eagles as Macro's Optio. The first book starts in 42 AD. The books cover the experiences of the two soldiers, initially as experienced centurion and new optio, in battles in Germania and the invasion of Britain by Claudius as part of the Legio II Augusta. The 6th book The Eagle's Prophecy has them serving as part of the Imperial Navy east of Italy. The 7th and 8th put them in Rome's eastern provinces as agents of the Emperor's secretary Tiberius Claudius Narcissus. The 9th sees them shipwrecked on the island of Crete, fighting against a full-scale uprising. The 11th is set in Rome with the leads hoping to save the emperor from the shady Liberators. The Blood Crows is set once again in Britannia. The two protagonists are faced with defeating tribal rebels.

A:
b