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: seeing requires light, Fact2: Sight is the mere ability to see, and the eye's responses to light shining into it., Question: What do eyes require? (A) a form of oxygen (B) Light shining into it (C) Exposure to oxygen and water (D) A dark environment (E) Contact lenses (F) melanin amount (G) tissue made of chondrocytes (H) Glasses
[A]: B

[Q]: Fact1: Many corals secrete an exoskeleton that builds up to become a coral reef., Fact2: Good examples are Bubble coral, Elegance coral, Frogspawn and other Euphyllia corals., Question: What is secreted by organisms like frogspawn to become a reef? (A) exocrine glands (B) food and shelter (C) exoskeleton (D) bones (E) Energy (F) Chemical energy (G) plasma (H) Energy.
[A]: C

[Q]: Fact1: Sponges have specialized cells called collar cells., Fact2: Special cells called collar cells pick up the planktonic food and start the digestive process., Question: What do sponges use to collect and digest food? (A) bloated stomachs (B) non-bacterial prokaryotes (C) specialized cells (D) holding nutrients (E) dermal & vascular tissue (F) specialized limbs (G) large mouth (H) unicellular organisms
[A]:
C