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: acid rain has a negative impact on water quality, Fact2: Sulfur dioxide causes acid rain., Question: What has a negative impact on water quality? (A) Reverse osmosis (B) fossil fuels (C) Fresh water (D) Carbon filter (E) chlorofluorocarbons (F) Sulfur dioxide (G) Pollution (H) harmful substances
[EX A]: F

[EX Q]: Fact1: Cells are organized into tissues, and tissues form organs., Fact2: Major organs, including the kidneys and liver, begin to grow., Question: what forms the liver? (A) bile (B) alcohol (C) stones (D) animals (E) ovaries (F) cells (G) meat (H) humans
[EX A]: F

[EX Q]: Fact1: Minerals are chemical elements that are essential for body processes., Fact2: Children's bodies are in a developing process., Question: What is necessary for a growing child? (A) four limbs (B) stamina (C) hydration (D) food (E) pets (F) minerals (G) plastics (H) a measuring stick
[EX A]:
F