In this task, you are given a multiple-choice question and you have to pick the correct option. Answer with option indexes (i.e., "A", "B", "C", and "D").

[EX Q]: Which of the following is never an element used to make carbohydrates for the plant? (A) sand (B) water (C) sunlight (D) carbon dioxide
[EX A]: A

[EX Q]: A storm ravages a town for a week straight, complete with deluges of rain. If someone in that town needs a source of water, it is (A) everywhere (B) missing (C) in short supply (D) rare
[EX A]: A

[EX Q]: The largest organ of the human body is what? (A) heart (B) brain (C) lungs (D) outer layer
[EX A]:
D