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: Biodiversity increases the productivity and stability of ecosystems., Fact2: An ecosystem includes the organisms and their habitat., Question: what does biodiversity increase the productivity and stability of? (A) density (B) the looseness of soil (C) water vapor (D) the environment (E) h2o (F) swamp vegetation (G) biological diversity (H) organisms and their habitat
[EX A]: H

[EX Q]: Fact1: disease-causing microbes have a negative impact on the body, Fact2: Water was tested for the presence of disease-causing microbes., Question: Water that is not what can have a negative impact on the body? (A) salinity (B) chemicals (C) sweat (D) an object (E) tested (F) deadly (G) dangerous (H) dead
[EX A]: E

[EX Q]: Fact1: Mollusks live in most terrestrial, freshwater, and marine habitats., Fact2: Clams, oysters and snails are familiar mollusks., Question: what lives in most terrestrial, freshwater, and marine habitats? (A) fungi (B) homogenous (C) oysters (D) a fish (E) animals (F) bacteria (G) ducks (H) barnacles
[EX A]:
C