This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Systemic Bacteriology (Gram Positive Bacilli, Gram Negative Bacilli), Subject name: Microbiology
[{'content': "Bull's neck is characteristically seen in: \nSelect and explain. \nA. Hamaoma of Lung, B. Diphtheria, C. Glaucoma, D. Hepatic Candidiasis", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Faucial diphtheria : commonest type of diphtheria. Characterized by fever, sore throat, pseudo membrane over fauces. Cervical adenitis with sub-mandibular edema is called bull neck.', 'role': 'assistant'}]