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 Input:
Organisms with only one cell (A) are prohibited from specializing (B) can freely specialize openly (C) are unsure what specializing is (D) learn how to specialize

Ex Output:
A


Ex Input:
a compass uses iron to locate the northern (A) latitude (B) axis (C) shoreline (D) hemisphere

Ex Output:
B


Ex Input:
A mechanical device requires 420 J of work to do 230 J of work in lifting a crate. What is the efficiency of the device? (A) 65% (B) 50% (C) 60% (D) 55%

Ex Output:

D