Answer :

A Calcium Hydride
Hydrogen Peroxide
Butene
A Lead Oxide
Hydrogen Peroxide is probably true most organic of the 4. I believe it is made in the liver, or some place in the body. Hydrocarbons and heavy metal compounds aren't organic, at all.
in order for it to be organic, it has to have carbon in it no matter what. the answer is C4H8