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A 70 year old farmer ,presented to you with complaints of yellowish discolouration of his finger nails for the past 6 months, he also gives history of recurrent episodes of itiching in the groin for which he used to take local home made herbal remedy. On examination 3 of his toe nails also show similar change with tunneling. Which among the following is the best test for rapid confirmation of your diagnosis?

AWoods lamp
BKOH mount
CBiopsy
DTzanck smear
Skin
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