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: Who wrote the Domesday Book? Passage:Roger Brito is listed in the Domesday Book of 1086 as holding land under the overlordship of the Church of Long Sutton in Somerset, in which county the family was later seated at Sampford Brett (alias Sandford-Bret). During the reign of King Henry I (11001135) Sampford Brett was held by Simon le Bret, from the feudal barony of Dunster by military service of half a knight's fee. He served in the household of Henry II's brother William, Count of Poitou and was a near neighbour of the FitzUrse family of Williton in Somerset, a member of which family was another of the assassins of Thomas Becket. Simon le Bret had two sons: Richard Brito, one of the assassins of Thomas Becket and Edmund le Bret, who adopted the surname de Sandford from his seat. William the Conqueror granted a manor in the eastern part of the parish of Great Stamford Bridge in Essex and another in Sanford in Somerset to a Norman named Auvrai Le Breton following the Norman conquest of England. A later relative, Simon Le Breton, had two sons, Richard and Edmund, who inherited their share of Sanford and Great Master Bridge. Both were part of the royal court of King Henry II; in particular Richard Le Breton was a close friend of the king's brother, Prince William.
b