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: mechanical weathering is when rocks are broken down by mechanical means, Fact2: Water is a mechanical weathering force., Question: What  weathers rocks? (A) soil (B) streams (C) a delta (D) calcite (E) erosion (F) water (G) grass (H) the sun
answer:
F


question:
Fact1: astronauts require preserved food for extended flights, Fact2: Most of the Shuttle foods are preserved by dehydration, which saves weight and storage space., Question: astronauts require what food for extended flights? (A) Echinoderm. (B) layers of fat (C) dehydrated (D) fresh (E) hand picked (F) nutrients (G) frozen (H) hydration
answer:
C


question:
Fact1: coal is used for generating heat by burning, Fact2: Fossil fuels are coal, oil and natural gases., Question: What is used for generating heat by burning? (A) carbon dioxide (B) sunlight (C) calcite (D) Calcium carbonate (E) water (F) ice (G) peachleaf willow (H) fossil fuels
answer:

H