<prompt> Rain drop pigmentation is seen inChronic lead poisoningChronic Arsenic poisoningChronic Mercury poisoningAll of the above  <response>: chronic arsenic exposure from occupations for polonged periods 1-20 years may develop diffuse pigmentation predominant over trunk and is superimposed by 2-10mm macules of depigmentation producing characteristic rain drop appearence. IADVL textbook of dermatology, disorders of pigmentation page 786 