In this task, you're given a question, along with a context passage which has extra information available on certain terms mentioned in it, i.e., the proper nouns in the passage. Your job is to determine whether information from more than one term is needed to answer the question. Indicate your choice as 'a' for Yes or 'b' for No.

Question: How old was Mitchel when the event where he served with the Union began? Passage:John Mitchel, the most committed advocate of revolution, had been arrested early in 1848, then convicted on the purposefullycreated charge of Treason-felony. He was sentenced to transportation to Bermuda, where he joined other convicts labouring on the construction of the Royal Naval Dockyard on Ireland Island. He was subsequently sent to Van Diemen's Land (in present-day Tasmania, Australia) where he was soon to be joined by other leaders, such as William Smith O'Brien and Thomas Francis Meagher who had both been arrested after Ballingarry. John Blake Dillon escaped to France, as did three of the younger members, James Stephens, John O'Mahony and Michael Doheny. Meagher and John Mitchel (who had been transported there before for political activities) both managed to escape and emigrate to the United States in the early 1850s. They served on opposite sides of the American Civil War: Meagher serving with the Union, for which he recruited and commanded the Irish Brigade, and Mitchel allying himself with the South and living there, sending three sons to fight with the Confederacy.
a