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").
Q: Fact1: tidal energy can be used to produce electricity, Fact2: Ocean thermal is energy derived from waves and also from tidal waves., Question: What can be used to produce electricity? (A) light bulbs (B) waves (C) wind (D) headphones (E) rivers (F) coal (G) motors (H) viruses
A:
B