<prompt> Tyrosinosis most common cause is:Fumarylacetoacetate hydrolaseTyrosine transaminaseParahydroxy phenyl pyruvate hydroxylaseHomogentisate oxidase  <response>: Ans. A. Fumaryl Acetoacetate HydrolaseTyrosinosis or Tyrosinemia most common type is Type I Tyrosinemia. The enzyme defect is Fumaryl Acetoacetate Hydrolase deficiency. Incidence is 1 in 1846 live birth. Type II and III Tyrosinemia is rare types. 