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").
One 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
Solution is here: C
Explanation: This is a good example. Based on the facts plants require sunlight in order to take over an area.

Now, solve this: Fact1: Viruses cause many human diseases., Fact2: Human viruses are created by natural process., Question: Something that can cause many human diseases can be what? (A) deadly and devastating (B) Disease textbooks (C) harmful substances (D) Microscopic organisms (E) Human thoughts (F) destroying life (G) Human emotions (H) Created by a natural process.
Solution:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
H