You will be given a definition of a task first, then some input of the task.
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").

Fact1: Plants that are adapted to very dry environments are called xerophytes., Fact2: Succulents, bromeliads and cacti are xerophytes., Question: Cacti are adapted to what? (A) the snow (B) dry environments (C) Animal survival (D) survival (E) tropical regions (F) moist environments (G) relocation (H) salt and water.
Output:
B