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 original member of Jethro Tull was the youngest? Passage:Jethro Tull are an English progressive rock band from Blackpool. Formed in December 1967, the group originally included vocalist and flautist Ian Anderson, guitarist and backing vocalist Mick Abrahams, bassist Glenn Cornick and drummer Clive Bunker. After contributing to the band's debut album This Was, Abrahams left Jethro Tull in December 1968, citing disagreements with the band's "basic policies, both musically and otherwise". He was replaced before the end of the year by Martin Barre, after rehearsals and stand-in performances by David O'List and Tony Iommi. Keyboardist John Evan was added to the band's lineup in April 1970, after contributing to Benefit as a guest performer. By the end of the year, Cornick had left the band due to "musical differences", with Jeffrey Hammond-Hammond taking his place. Anderson was left as the sole original member of the group by May 1971, when Bunker also left due to their heavy touring schedule. He was replaced by Barriemore Barlow.


a