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: Many corals secrete an exoskeleton that builds up to become a coral reef., Fact2: Good examples are Bubble coral, Elegance coral, Frogspawn and other Euphyllia corals., Question: What is secreted by organisms like frogspawn to become a reef? (A) exocrine glands (B) food and shelter (C) exoskeleton (D) bones (E) Energy (F) Chemical energy (G) plasma (H) Energy.

Ex Output:
C


Ex Input:
Fact1: erosion causes a river to become deeper and wider, Fact2: Weathering and erosion continue to shape it today., Question: Weathering causes what to become deeper and wider? (A) a landslide (B) Sediment (C) a mountain (D) a volcano (E) soils (F) rock (G) flooding (H) a river

Ex Output:
H


Ex Input:
Fact1: Mollusks are invertebrates such as the common snail., Fact2: Gastropods are snails and slugs., Question: What are invertebrates such as gastropods? (A) insects (B) watermelon (C) squids (D) barnacles (E) mollusks (F) graptolites (G) food (H) starfish

Ex Output:

E