Answer the following question, with explanation first.
Billy turned off the water by using the diaphragm. A diaphragm is a type is what?\nOptions:\n- drugstore\n- human\n- bivalve\n- valve\n- gas pump

valve
Valve is a device for controlling the passage of fluid or air through a pipe, duct, etc.

, especially an automatic device allowing movement in one direction only.

Billy turned off the water by using the diaphragm.

A diaphragm is a type of Valve.

.

Therefore, the answer is valve