This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Concept of health and disease, Subject name: Social & Preventive Medicine
"Bullneck" appearance is a characteristic feature seen in 
Select and explain. 
A. Epidermolysis bullosa, B. Severe Diphtheria, C. Epidemic Parotiditis, D. Acute Epiglottitis
B: Severe Diphtheria
Answer: B: Severe Diphtheria 
Explanation: Regional lymphadenopathy in diphtheria causes a brawny thickening /swelling all around the neck, giving a 'bull neck" appearance Ref : Park 23rd edition Pgno : 161