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]: Photosynthesis features (A) single celled organisms (B) humans (C) cats (D) fish
[EX A]: A

[EX Q]: A needle lined with magnets will pull north. If north is to the right and you want to go west, you'd walk (A) straight (B) left (C) backwards (D) right
[EX A]: A

[EX Q]: Reducing bacteria in food prevents what? (A) electricity (B) maladies (C) observation (D) signals
[EX A]:
B