Step 1: Concept
Pharmacovigilance involves the monitoring of the safety and effects of drugs.
Step 2: Meaning
ADR is a standard medical abbreviation used in clinical pharmacy and medicine.
Step 3: Analysis
An Adverse Drug Reaction is any noxious, unintended, and undesired effect of a drug that occurs at doses used for prevention, diagnosis, or therapy. It is distinct from an overdose.
Step 4: Conclusion
In the context of pharmacy, ADR stands for Adverse Drug Reactions.
Final Answer: (B)