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: Pediatrics
[{'content': "'Bull neck' in Diphtheria is due to – \nSelect and explain. \nA. Retropharyngeal abscess, B. Laryngeal edema, C. Cellulitis, D. Lymphadenopathy", 'role': 'user'}, {'content': 'Answer: D \nExplanation: Clinical manifestations of diphtheria \nA) Faucial (tonsillo pharyngeal) diphtheria\n\nIt is the commonest type of diphtherial infection.\nThe incubation period is 2-5 days.\nPatients present with malaise, sore throat and moderate fever.\nA thick adherent pseudo membrane (grey or white) is present on one or both tonsils or adjacent pharynx.\nDislodging the membrane is likely to cause bleeding.\nA small percentage of patients present with massive swelling of the tonsils and uvula with cervical lymphadenopathy (bull neck) and severe toxaemia → malignant diphtheria.\nSystemic toxicity (toxaemia) is usually most severe when pseudo membrane extends from tonsil and pharynx (faucial diphtheria) to adjacent areas.\n\nB) Laryngeal diphtheria\n\n\nPresents as hoarseness and cough.\nIt is the most severe form of respiratory diphtheria.\nTrocheostomy may be required.\n\nC) Nasal diphtheria\n\nPresents with unilateral or bilateral nasal discharge.\nThe mildest form of respiratory diphtheria\n\nD)Cutaneous diphtheria\n\nCaused by nontoxigenic strains\nPresents as distinct "punched out" ulcers.\nMore common in tropical areas.\nOther less common types of diphtheria are conjunctiva, otitis, genital - (vulval, vaginal or preputial), gastrointestinal.', 'role': 'assistant'}]