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").

Let me give you an example: Fact1: a plant requires sunlight to grow, Fact2: Plants to avoid are fast-growing vines that can take over an area in no time., Question: What requires sunlight in order to take over an area? (A) spores (B) fish (C) plants (D) humans (E) pods (F) Oak (G) opossums (H) coral
The answer to this example can be: C
Here is why: This is a good example. Based on the facts plants require sunlight in order to take over an area.

OK. solve this:
Fact1: Ants communicate with chemicals called pheromones., Fact2: Physiologically, ants leave a trail of pheromones, which other ants then follow., Question: How do ants communicate to other ants to encourage them to follow? (A) Skywriting (B) Electrical energy (C) Using a phone to communicate (D) Leaving a written communicatio (E) Something coming from a gland (F) By wind and rain (G) Chemical energy (H) Leaving chemical trails
Answer:
H