Definition: 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.
Input: Question: Which city had a larger population the during the decade that Davies worked in London as a pharmacist? Passage:Talfan Davies was brought up in Gorseinon. During the 1930s Davies worked in London as a pharmacist before returning to Wales and settling in Swansea. He was the brother of Sir Alun Talfan Davies QC, with whom he founded the publishing company, Llyfrau'r Dryw (later succeeded by Christopher Davies). Aneirin Talfan Davies, who was known by the bardic name of Aneurin ap Talfan, also founded the Welsh language periodicals, Heddiw () and Barn (). He was Head of Programmes Wales at the BBC and produced broadcasts of early works by Dylan Thomas. Following Dylan's death, he wrote a critical study of Thomas as a religious poet. He also translated the poetry of Christina Rossetti into Welsh, and edited the letters of the artist an poet David Jones, whose influence can be discerned throughout his work.

Output:
a