instruction:
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").
question:
Fact1: Air pollution harms the respiratory and circulatory systems., Fact2: Cars are a significant source of air pollution., Question: What harms the respiratory and circulatory systems? (A) oil (B) rain (C) sulfur (D) cars (E) tires (F) coal (G) tar (H) bicycles
answer:
D


question:
Fact1: Viruses are so small that they can be seen only with an electron microscope., Fact2: Electron microscope is developed in Germany., Question: viruses are so small that they can be seen only with a device developed where? (A) A computer (B) sunlight (C) Light (D) germany (E) retina (F) at home (G) canada (H) taiwan
answer:
D


question:
Fact1: a valley is formed by a river flowing, Fact2: Examples are Napa Valley and Sonoma Valley., Question: what were formed by a river flowing? (A) Statue of Liberty (B) body water (C) swamp vegetation (D) Rockies (E) Napa and Sonoma (F) clouds (G) Sediment (H) Calcium carbonate
answer:

E