This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Salivary Gland, Subject name: Surgery
[{'content': 'In which one of the following conditions the sialograph is contraindicated? \nSelect and explain. \nA. Ductal calculus, B. Chronic parotitis, C. Acute parotitis, D. Recurrent sialadenitis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. (c) Acute parotitisRef Bailey 25/e p755Sialography:* Contrast Examination of Salivary glands and DuctsIndication:* Salivary gland stones and stricture* Chronic Sialadenitis* Tumors of salivary glands* Contraindication:* Allergy to contrast* Acute Sialadenitis', 'role': 'assistant'}]