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: condensation causes clouds to form, Fact2: Clouds do create rain., Question: What causes rain to fall? (A) a hydraulic system (B) Water expanding (C) kinetic energy (D) heating liquids (E) Condensation (F) Evaporation (G) fossil fuels (H) circulatory system
A:
E