<prompt> Which of the following is not true about hydroquinone?It is a weak hypopigmenting agentIt inhibits tyrosinaseResponse is incomplete and pigmentation may recurIt should not be used for melasma or chloasma of pregnancy  <response>: Ans. isdi.e., It should not be used for melasma or chloasma of pregnancy .Ref: KDT Vhle p. 8921Hydroquinone:It is a weak hypopigmentation agent.Inhibits tyrosinase and other melanin forming enzymes, decreases formation of and increases degradation of melanosomes.Regular application as 2-6 lotion or cream for months is required in melasma, chloasma of pregnancy, etc. 