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
[{'content': 'When a drug creates an effect that is unpredictable and unique it is termed as \nSelect and explain. \nA. Side effect, B. Toxicity effect, C. Idiosyncratic effect, D. Drug-on Drug effect', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]