<prompt> Ochronosis is seen in poisoning withBoric acidCarbolic acidOxalic acidHCl  <response>: CARBOLIC ACID phenol; OH In the body, phenol is paly oxidised to hydroquinone and pyrocatechol. CHRONIC POISONING PHENOL MARASMUS It is characterised by anorexia, weight loss, headache, veigo, dark urine and pigmentation of skin and sclera. The hydroquinone and pyrocatechol may cause pigmentation in the cornea and various cailages, a condition called oochronosis. Oochronosis is commonly associated with alkaptonuria an inborn error of metabolism, in which homegentisic acid gets deposited in cailages, ligaments and fibrous tissues. Ref:- k s narayan reddy; pg num:-535 