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: Dental
Scratch sign is positive in 
Select and explain. 
A. Tinea capitis, B. Tinea unguium, C. Tinea versicolor, D. Tinea mannum
C: Tinea versicolor
Answer: C: Tinea versicolor 
Explanation: Scratch sign is present in Tinea versicolor, where firmly scratching the skin makes the scales visible.