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: Surgery
[{'content': 'Mixed tumours of the salivary glands are \nSelect and explain. \nA. Most common in submandibular gland, B. Usually malignant, C. Most common in parotid gland, D. Associated with calculi', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]