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: Anatomy
[{'content': "All of the following cause a gray white membrane on the tonsils except: \nSelect and explain. \nA. Infectious mononucleosis, B. Ludwig's angina, C. Streptococcal tonsillitis, D. Diptheria", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ludwigs angina is cellulitis of submandibular space.It does not lead to membrane formation over tonsils. DD of membrane over tonsil: 1.Membrane tonsillitis. 2.Diphtheria 3.Vincent angina 4.Infectious mononucleosis 5.Agranulocytosis 6.Leukaemia 7.Aphthous ulcer 8.Malignancy ulcer 9.Traumatic ulcer 10.Candidal infection of tonsil Ref Dhingra 5/e,p 274,6/e,p 259-260.', 'role': 'assistant'}]