<prompt> Oochronosis is found in:AlkaptonuriaTyrosinemiaPhenylketonuriaHomocystinuria  <response>: a. AlkaptonuriaRef: Nelsons 20e p 636, Ghai 8e p 652Ochronosis dark spot on scleraear cartilage is seen in Alkaptonuria which is an autosomal recessive disorder due to deficiency of enzyme homogentisic acid oxidase. 