When an unwanted and potentially harmful reaction is known to be or suspected to be caused after the administration of a certain drug it is called an Adverse drug reaction (ADR). If this reaction is caused by the administration of an investigational medicinal product then it is called an adverse reaction (AR). When any unwanted reaction is caused during the treatment with a certain drug but not caused necessarily by it, it is called an adverse event (AE). A side effect is a secondary effect to the intended one.
The correct answer is C.
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