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: soil erosion means soil loss through wind, Fact2: Wind is defined as moving air., Question: what causes soil loss from soil erosion? (A) nutrients (B) flooding (C) rainfall (D) moving air (E) deforestation (F) forces (G) stagnant air (H) lome
[EX A]: D

[EX Q]: Fact1: melting is when solids are heated above their melting point, Fact2: Ice cubes melt in liquid water., Question: What, when heated, turns into liquid water? (A) gasoline (B) oil (C) a solute (D) fire (E) ice cubes (F) a prism (G) mussels (H) Energy.
[EX A]: E

[EX Q]: Fact1: Ancestors of hagfish are thought to have been the earliest vertebrates., Fact2: Animals with backbones are called vertebrates., Question: Ancestors of hagfish are thought to have been the earliest animals with? (A) sunlight (B) cells (C) several genes (D) fossil record (E) ice (F) backbones (G) pigmentation (H) antibodies
[EX A]:
F