which drug is an illegal stimulant?\nmotion sickness medication\ncocaine\ncold medicine\ncough syrup

Brief Explanations:

Motion sickness medication, cold medicine, and cough syrup are generally legal medications used for specific medical purposes. Cocaine, on the other hand, is a powerful stimulant that is illegal in most countries due to its high potential for abuse and harmful effects on the body and society.

Answer:

cocaine