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: conserving water can be used for survival in a dry environment, Fact2: We learned about desert plants and how they adapt themselves to the hot dry desert environment so they can survive., Question: Plants can conserve water in order to survive where? (A) our planet (B) in a vacuum (C) in the desert (D) Earth's atmosphere (E) In the winter (F) in a laboratory (G) on the moon (H) forest is destroyed
[A]: C

[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: temperature changing can cause phase changes, Fact2: Temperature also changes with the seasons., Question: what can cause phase changes? (A) Electrical (B) an object (C) seasons (D) imbalanced (E) hormones (F) sweating (G) Winter (H) climate
[A]:
C