Answer:
C. individual reaction to the drug
Explanation:
Individual reaction to a drug is an abnormal reaction to a drug substance which is not intended. It can also be referred to as adverse drug reaction or allergic drug reaction, and the tendency for this to occur is not peculiar to a particular drug as it can occur from any drug substance depending on the individual in which the drug is administered.
The most obvious signs and symptoms of this allergic reaction include; fever, rashes. This type of drug reaction can also lead to a life-threatening condition in which multiple body systems are involved which can be referred to as anaphylaxis.
