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: pathogens can cause disease, Fact2: Mad Cow disease is a concern., Question: What can cause Mad Cow? (A) Pollution (B) bacteria (C) cows (D) horses (E) illness (F) pathogens (G) influenza (H) chickenpox
F

Fact1: Adult worms go through a major transformation to develop reproductive organs., Fact2: An enlarged cummerbund-like band near the worm's head holds the reproductive organs., Question: What grows a cumberbund-like band around itself in adulthood? (A) legumes (B) Bats (C) mammals (D) bamboo (E) swea (F) worms (G) fungi (H) bushes
F

Fact1: Amphibians have sense organs to smell and taste chemicals., Fact2: Smell and taste belong to our chemical sensing system., Question: Amphibians have what sort of sensing system? (A) strong (B) retina (C) four limbs (D) chemical (E) mechanical (F) the eyes (G) nerves (H) heat or cold
D