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").

[Q]: Fact1: smoking tobacco decreases stamina, Fact2: Manual dexterity and physical stamina are vital., Question: What decreases manual dexterity? (A) Dehydration (B) lifting weights (C) hypothyroidism (D) prolonged thirst (E) working out (F) eating healthy (G) smoking tobacco (H) Abnormal cell growth
[A]: G


[Q]: Fact1: Viruses cause many human diseases., Fact2: Some smallpox viruses are maintained in laboratories., Question: What can smallpox cause? (A) contamination (B) harmful substances (C) vaccines (D) photosynthesis (E) extinction (F) cellular respiration (G) Destroy crops (H) human disease
[A]: H


[Q]: Fact1: high pressure systems cause clear weather, Fact2: Weather Clear weather usually means good visibility., Question: What causes good visibility? (A) permineralization (B) focusing a lens (C) high pressure systems (D) flashlights (E) peachleaf willow (F) the Great Barrier Reef (G) an electron microscope (H) windpower operated machines
[A]:
C