<prompt> A female has hypopigmented lesion on centre of forehead drug, responsible is:HydroquinoneMono benzene metabolite of hydroquinonePara tetra butyl catecholPara tetra butyl phenol  <response>: D i.e. Para tetra butyl phenol Dermatology 3e p. 92; Fitzpatricks 7e p-135-145; Rooks 7e p.17.7-17.37; Roxburghs 17e p- 105-109 - Most common cause of air borne contact dermatitis ABCD in India is pahenium hysterophorus congress grass plantQ - Metal most commonly lt allergic contact dermatitis ACD is nickel NiQ and drug is neomycin. Whereas detergentQ are most common cause of ACD in Indian females. - Para-tetra p-test-Butyl phenol formaldehyde glue resin on BindiQ is most common cause of ACD or hypopigmentation on centre of forehead in Indian females. 