Definition: 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").
Input: If the temperature is 34 degrees Fahrenheit, what could be put on top of the icy sidewalk to turn the ice to liquid? (A) sodium (B) dry leaves (C) pebbles (D) dry ice
Output:
A