Which describes a side effect?

(1 point)
Responses

the need for increasingly larger amounts of the drug
the need for increasingly larger amounts of the drug

an unwanted physical or mental effect caused by a drug
an unwanted physical or mental effect caused by a drug

developing a chemical need for a drug
developing a chemical need for a drug

the body’s reaction to not having the drug
the body’s reaction to not having the drug

an unwanted physical or mental effect caused by a drug