<prompt> Brown skin cornea is seen in -a Siderosisb Mustard gas exposurec Chalcosisd Argyrosisacbcadb  <response>: Brown discoloration of cornea may be seen in :-Siderosis Iron deposition Chalcosis copper deposition : KF rings Drugs : Phenothiazines vii Kyrle diseaseChrysiasis gold depositionBlood stainingBenzoquinone, hydroquinineArgyrosis silver deposition causes slate gray discoloration.I am not sure about option b 