You will be given a definition of a task first, then some input of the task.
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: Lymph is a fluid that leaks out of capillaries into spaces between cells., Fact2: Capillaries are microscopic vessels., Question: What does lymph fluid leak out of into spaces between cells? (A) inherited antigens + antibody (B) Microscopic vessels. (C) nucleotides composing polymers (D) saves lives (E) Leaking sink. (F) antigens that cause allergy (G) Plumbing pipes. (H) Outer space.
Output:
B