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': 'There are some undesirable but unavoidable pharmacodynamic effects of a drug, which are known as: \nSelect and explain. \nA. Toxic effects, B. Idiosyncrasy, C. Side effects, D. Intolerance', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]