A commonly used ingredient in a tincture to control microbes is

Aphenol.
Bethyl alcohol.
Cethylene oxide.
Diodine.

Verified Answer :

The answer is D. Tincture iodine is an antiseptic which is effective against bacteria and virus.

D. Iodine
Iodine is a very good disinfecting agent, and is used whenever treating wounds. It is usually found in solutions in the form of a salt, potassium iodide. Other compounds are also used, such as alcohols; however, the most commonly used one is iodine.