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: poisonous darts are used for defense by sea anemones, Fact2: Protection at the gateway is the best defense., Question: What are used as protection by sea anemones? (A) lamphreys (B) poisonous darts (C) tubular organ (D) feed on dead protists (E) coelenterates (F) islets of Langerhans (G) related organisms (H) moisturize their skin
[EX A]: B

[EX Q]: Fact1: Carbon cycles quickly between organisms and the atmosphere., Fact2: Water, carbon dioxide, and nitrogen are all needed by living things., Question: What is needed by living things? (A) hate (B) sunlight (C) Chemical energy (D) pain (E) love (F) hydration (G) The atmosphere (H) Energy.
[EX A]: G

[EX Q]: Fact1: Some insects can use their antennae to detect sound., Fact2: An insect's head has two feelers, or antennae., Question: What can some insects use their feelers to detect? (A) kale (B) noise (C) water vapor (D) tremors (E) waves (F) vibrate (G) air (H) sound
[EX A]:
H