Given the task definition and input, reply with output. In this task, you are given two facts, and a multiple-choice question. Based on the given facts, answer the question with index of the correct option (e.g, "A").

Fact1: Some pelycosaurs gave rise to a group of animals called therapsids., Fact2: Pelycosaurs and therapsids are theropsids., Question: what are therapsids? (A) bacteria (B) animals (C) lamphreys (D) tigers (E) prokaryote (F) marine (G) arachnids (H) aquatic
B