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
Which of the following is done for the quick diagnosis of Erythrasma ? 
Select and explain. 
A. Biopsy, B. KOH examination, C. Culture and sensitivity, D. Wood's lamp examination
D: Wood's lamp examination
Answer: D: Wood's lamp examination 
Explanation: Ans is'd i.e. Wood's lamp examination(Ref. IADVL text book of dermatology 3d/e p. 236).Erythrasma is caused by infection by Coryneform bacteria.Wood's lamp examination is a commonly used test to diagnose Erythrasma.Lesion shows coral red fluorescence dre to coproporphyrin III production by the bacteria.