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: Most amphibians breathe with gills as larvae and with lungs as adults., Fact2: All frogs are amphibians., Question: What do frogs breathe with when they are adults? (A) skin (B) fins (C) lungs (D) oxygen (E) gills (F) air (G) Energy (H) Gases

Ex Output:
C

Ex Input:
Fact1: high pressure systems cause clear weather, Fact2: Weather Clear weather usually means good visibility., Question: what does a high pressure system cause? (A) hyperthyroidism (B) lowered energy cost (C) harmful substances (D) Heart rate (E) good visibility (F) It gets heated up (G) Pollution (H) rainfall

Ex Output:
E

Ex Input:
Fact1: a cactus stem is used for storing water, Fact2: Other animals eat cactus to get water., Question: Why do animals eat stems? (A) Animal survival (B) A transportation fuel (C) it keeps an organism warm (D) It gets more light (E) basic building blocks of life (F) Plants store liquids there (G) it needs them (H) Help plants grow

Ex Output:
F