<prompt> In porphyra cutanea tarda the type of porphyrin excreted in urine isCoproporphyrin - IUroporphyrin - IUroporphyrins - IIType I III uroporphyrins  <response>: Porphyria cutanea tarda is also known as cutaneous hepatic porphyria. The paial deficiency of enzyme Uroporphyrinogen decarboxylase is responsible for the occurrence of porphyria cutanea tarda. Hence there is an increased excretion of uroporphyrins 1 and 3 