<prompt> Oil drop sign of nail is seen in?Lichen planusDermatophytesLupus vulgarisPsoriasis  <response>: Ans. d PsoriasisRef: Lippincotts Primary Care Dermatology p 47, Bar an and Dawbers Disease of the Nails ad their Management by Robert Baran, David A. R. de Berker, Mark Holzberg, Luc Thomas ch-6 