Q: 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: Most ecosystems get energy from sunlight., Fact2: Lakes and rivers are extremely complex ecosystems., Question: Where do lakes get energy from? (A) a delta (B) water (C) petroleum (D) sun's heat (E) gasoline (F) Evaporation (G) sunlight (H) heat
A:
G