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
When a drug creates an effect that is unpredictable and unique it is termed as 
Select and explain. 
A. Side effect, B. Toxicity effect, C. Idiosyncratic effect, D. Drug-on Drug effect
C: Idiosyncratic effect
Answer: C: Idiosyncratic effect 
Explanation: None