Given the task definition and input, reply with output. 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 many casualties were there in the battle after which Edward IV's brother was beheaded? Passage:John Courtenay is said to have been originally intended for a career in the church. He was knighted by his brother, Thomas Courtenay, 6th/14th Earl of Devon, after the Battle of Wakefield. After the Battle of Mortimer's Cross, the future King Edward IV of England marched and took the capital from the Lancastrians. Parliament voted an attainder on his opposition, and John declared a traitor. The effect of the attainder was to terminate the Barony of Okehampton (creation 1299), so that the Earldom inherited from the Redvers family was in abeyance, passing laterally to the descendants of Courtenay's sisters The new King, Edward IV, marched north and sealed his reign with the bloody victory at the Battle of Towton, following which his brother was beheaded. About 1465, Courtenay was in exile in France with Queen Margaret of Anjou (wife of King Henry VI of England). He was titular Earl of Devon from 1469.
b