Answer:
A. Stimulant
Explanation:
A stimulant is any drug that excites any bodily function. Cocaine gives the user extreme happiness and energy.
The type of immunity that uses both helper and killer cells is Cellular Immunity. It is used by Cellular immunity to classify the abnormal cells. Once abnormal cells are detected it is destroyed by Cellular Immunity. Cellular Immunity serve as resistance from diseases caused by viruses.
