This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General, 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 o 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 due to coproporphyrin III production by the bacteria.ConditionFluorescent coloursTinea capitisBright yellow greenErythrasmaCoral red or pinkVitiligoMilky whiteAlbinismBlue whiteLeprosyBlue whiteTuberous sclerosisBlue whitePseudomonas infectionGreenish whitePorphyriaPink/orangeTinea versicolorGolden yellow