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: Skin
[{'content': 'Scutula is classically seen in: \nSelect and explain. \nA. Favus, B. Small spore ectothrix, C. Endothrix, D. Kerion', 'role': 'user'}, {'content': "Answer: A \nExplanation: Scutula is the charecteristic lesion of us. The classical picture of tinea capitis caused by Trichophyton schoenleinii is characterized by the presenceof yellowish cup-shaped crusts known as scutula which develops round a hair. Adjacent crusts confluent and form a mass of yellow crusting. Note: the other three options mentioned are morphological forms of T.capitis. Ref: Rook's textbook of dermatology, Edition-8, Page 36.27.", 'role': 'assistant'}]