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").

[EX Q]: Fact1: Male dogs use pheromones in urine to mark their territory., Fact2: Pheromones are natural aphrodisiacs., Question: What do male dogs use in urine to mark their territory? (A) Natural aphrodisiacs (B) competing for resources (C) Tails (D) Urine cleaner (E) Something coming from a gland (F) Chemical energy (G) an area swollen with pus (H) Chew toys
[EX A]: A

[EX Q]: Fact1: when a hemisphere is tilted away from the sun , that hemisphere receives less direct sunlight, Fact2: Sunlight is delivered in small packets of energy called photons., Question: What does a hemisphere receive less of if it is tilted away from the sun? (A) Light (B) rain (C) warmth (D) Epidermis (E) body water (F) photons (G) cold air (H) sugar
[EX A]: F

[EX Q]: Fact1: harming an animal species has a negative impact on the population size of that species, Fact2: People understand that habitat destruction and pollution are harmful to wildlife., Question: What has a negative impact on a species population size? (A) influenza (B) assistance (C) pollution (D) distractions (E) liver cancer (F) copper (G) Pesticides (H) disease
[EX A]:
C