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: Mating is generally preceded by courtship., Fact2: For example, a black rooster and a white hen mate, and the resulting offspring are gray., Question: What can result in offspring? (A) seeds (B) competition (C) courtship (D) travel (E) resistance (F) solitude (G) litter (H) reading
[EX A]: C

[EX Q]: Fact1: Sponges have specialized cells called collar cells., Fact2: Flagellum of collar cell cause current to pass over collar and food is collected., Question: Which aspect of a sponge's cells allow it to collect food? (A) the cervix (B) teeth (C) flagellum (D) cartilage (E) plasma (F) osculum (G) tissue (H) potassium
[EX A]: C

[EX Q]: Fact1: the color of leaves on deciduous trees usually changes in the autumn season, Fact2: Peachleaf willow is a deciduous tree., Question: What does a peachleaf willow do in the autumn? (A) staying warm (B) It expands (C) Die (D) Change colors (E) Fall over (F) Grow new flowers (G) flowers (H) spread flower seeds
[EX A]:
D