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 Q]: Fact1: bacteria can cause people to become ill, Fact2: People frequently die of illnesses ., Question: What can cause people to die? (A) viruses (B) Dehydration (C) stars (D) smallpox (E) bacteria (F) clouds (G) flooding (H) Saturn
[EX A]: E

[EX Q]: Fact1: cold fronts cause thunderstorms as they pass by, Fact2: If cold air replaces warm air, it is called a cold front., Question: What does cold air replacing warm air cause? (A) Greenhouse gases (B) Pollution (C) Dehydration (D) thunderstorms (E) steady barometer readings (F) hypothyroidism (G) constant air pressure (H) stagnant air temperature
[EX A]: D

[EX Q]: Fact1: a vehicle is used for travel, Fact2: Trucks and cars are vehicles., Question: What are trucks and cars used for? (A) Pollution (B) Travel (C) food (D) damaging (E) Walking (F) safety (G) heating (H) Taking up space
[EX A]:
B