This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fungal Infection, Subject name: Skin
Which of the following tests is used in the diagnosis of Tinea faciei? 
Select and explain. 
A. Gram's stain, B. KOH mount, C. Tissue smear, D. Wood's lamp
B: KOH mount
Answer: B: KOH mount 
Explanation: Ans. B. KOH mountTinea faciei is the dermatophyte infection of the face and is diagnosed by KOH smear.* Tinea faciei is an infection of the glabrous skin of the face with a dermatophyte fungus (the mustache and beard areas of the adult male are excluded).* Trichophyton mentagrophytes and T. Rubrum predominate, but T. Tonsurans, M. audouinii, and M. canis are also common causes of Tinea faciei.Tinea faciei