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: In what countries are the headquarters of the churches that venerate Mari as a saint? Passage:Saint Mari, also known as Mares and originally named Palut, is a saint of the Church of the East. He was converted by Thaddeus of Edessa (a.k.a. Addai) and is said to have had Mar Aggai as his spiritual director. He is believed to have done missionary work around Nineveh, Nisibis, and along the Euphrates, and is said to have been one of the great apostles to Syria and Persia. He was buried in Dair-Kuni. His feast day is 5 August in the Christian calendar. He and Thaddeus are credited with the Liturgy of Addai and Mari. Despite the fact that there is little, if any, concrete information on Mari, he is still venerated as a saint by the Assyrian Church of the East, the Chaldean Catholic Church, the Roman Catholic Church, and the Syro-Malabar Catholic Church. He is distinct from St Mari of the seventy disciples with whom the Apocryphal Acts of Mar Mari are connected.


a