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").

Ex Input:
Fact1: Migrants typically travel long distances., Fact2: Migrant birds arrive., Question: What travels long distances? (A) humans (B) jets (C) rocks (D) birds (E) camels (F) cocoons (G) Light (H) eggs

Ex Output:
D


Ex Input:
Fact1: Some pelycosaurs gave rise to a group of animals called therapsids., Fact2: Pelycosaurs are an important lineage preserved in the fossil record., Question: How do we know the lineage of therapsids? (A) Laboratory (B) dinosaurs (C) prokaryotic cells (D) some anthozoans (E) fossil record (F) oral tradition (G) polygenic (H) calibrated

Ex Output:
E


Ex Input:
Fact1: Mammals can also generate little bursts of heat by shivering., Fact2: Shivering causes muscle contractions to warm the body., Question: Mammals can also generate little bursts of heat by (A) muscle contractions (B) circulation (C) exhalation (D) Temperature changing (E) Movement of an air mass (F) flow of electrons (G) vibrations (H) with their fur

Ex Output:

A