This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of protein and amino acid, Subject name: Biochemistry
In porphyra cutanea tarda the type of porphyrin excreted in urine is 
Select and explain. 
A. Coproporphyrin - I, B. Uroporphyrin - I, C. Uroporphyrins - II, D. Type I & III uroporphyrins
D: Type I & III uroporphyrins
Answer: D: Type I & III uroporphyrins 
Explanation: 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