Choices:
(I) acid
(II) CO2
(III) kill
(IV) harm
(V) gas
(VI) form
(VII) CO 2
(VIII) HPV
Given those answer options, answer the question: Fact 1: Carbon monoxide is a gas produced by furnaces and other devices that burn fuel. Fact 2: Fuel is burned inside the engine. Given the two facts above, carbon monoxide, a product of furnaces and engines, is a:?
A:
(V)