Brown skin cornea is seen in -a) Siderosisb) Mustard gas exposurec) Chalcosisd) Argyrosis
Brown discoloration of cornea may be seen in :-


Siderosis (Iron deposition)     
Chalcosis (copper deposition) : KF rings           
Drugs : Phenothiazines vii) Kyrle disease
Chrysiasis (gold deposition)
Blood staining
Benzoquinone, hydroquinine


Argyrosis (silver deposition) causes slate gray discoloration.
I am not sure about option b
ac
bc
ad
b