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: Radiology
[{'content': "'Thumb print' sign seen in: \nSelect and explain. \nA. Candida, B. Aspergillus, C. Thrrmomyces, D. Epiglotis", 'role': 'user'}, {'content': "Answer: D \nExplanation: D. i.e. Epiglottitis: Thumbprint sign4 is a finding on lateral cervical spine radiograph that suggests dignosis of epiglottitisQ. This appearance is due to thickening of aryepiglottic folds, which causes it to appear more radiopaque, resembling the distal thumb. Differential Diagnosis of Thumb print sign in colon - Ulcerative colitisQ - Ischaemic colitisQ - Crohn's colitis - Pseudomembranous colitis.", 'role': 'assistant'}]