Detailed Instructions: 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: Rivers are usually larger than streams., Fact2: Second half becomes rocky with small stream crossings some standing water., Question: what are usually larger than small water crossings? (A) alveoli (B) an anion (C) tortoises (D) tail fins (E) engines (F) rivers (G) Inches (H) vehicles
A:
F