This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
What is the key purpose of pharmacovigilance? 
Select and explain. 
A. To monitor drug toxicity, B. To monitor unauthorized drug manufacture, C. Monitoring of students, D. Check costs
A: To monitor drug toxicity
Answer: A: To monitor drug toxicity 
Explanation: Pharmacovigilance (abbreted PV or PhV), also known as Drug Safety, is the pharmacological science relating to the collection, detection, assessment, monitoring, and prevention of adverse effects with pharmaceutical products. Pharmacovigilance studies play a major role in this population, paicularly those studies that investigate functional impairment as an impoant adverse drug event. Ref: Hilmer S.N., Ford G.A. (2009). Chapter 8. General Principles of Pharmacology. In J.B. Halter, J.G. Ouslander, M.E. Tinetti, S. Studenski, K.P. High, S. Asthana (Eds), Hazzard's Geriatric Medicine and Gerontology, 6e.