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: Did the pop group that Foster was a keyboardist for have more than three members? Passage:Foster was a keyboardist for the pop group Skylark, discovered by Eirik Wangberg. The band's song "Wildflower" was a top ten hit in 1973. When the band disbanded, Foster remained in Los Angeles and together with Jay Graydon he formed the band Airplay, whose album of the same name is often labeled as important within the west coast AOR genre. In 1975, he played on George Harrison's album Extra Texture. He followed that up by playing the Fender Rhodes and clavinet on Harrison's album Thirty Three & 1/3 a year later. In 1976 Foster joined Guthrie Thomas on Thomas' second Capitol Records album, Lies and Alibis, with Ringo Starr and a host of many other famed performers. Foster was a major contributor to the 1979 Earth, Wind and Fire album I Am, as a studio player and arranger, as well as being a co-writer on six of the album's tracks. The most noteworthy being the song "After the Love Has Gone", for which Foster and his co-writers, Graydon and Bill Champlin, won the 1980 Grammy Award for Best R&B Song.


b