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").
Problem:Fact1: a plant requires water to grow, Fact2: Ferns are vascular plants., Question: what requires water to grow? (A) density (B) ferns (C) gravity (D) rice (E) animals (F) Frogs (G) weathering (H) Oak
Solution:
B