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: Lymphocytes are the key cells involved in the immune response., Fact2: Antibodies are synthesised by lymphocytes., Question: What response are antibodies involved in? (A) resistance activities (B) the pituitary response (C) major threat to health (D) antigens summoning them (E) Leptospirosis (F) being taken as a supplement (G) resistance (H) the immune response
Output:
H