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: ENT
[{'content': "All of the following cause a grey-white membrane in the throat except - \nSelect and explain. \nA. Streptococcal tonsillitis, B. Diphtheria, C. Ludwig's angina, D. Adenovirus pharyngitis", 'role': 'user'}, {'content': "Answer: C \nExplanation: Causes of the membrane in the throat (Differential diagnosis of the membrane over the tonsil) \n\nPyogenic membranous tonsillitis\nInfectious mononucleosis\nTraumatic ulcers\nVincent's angina\nAgranulocytosis\nAdenovirus pharyngitis\nCandidal infection of tonsil\nLeukemia\nDiphtheria\nAphthous ulcers", 'role': 'assistant'}]