This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pathology
Which of the following is not true about Porphyria cutanea tarda (PCT)? 
Select and explain. 
A. Is the least common type of human porphyria, B. Decreased activity of the enzyme uroporphyrinogen decarboxylase, C. Prior hepatitis C virus infection appears to be an independent risk factor, D. Treatment of PCT consists of repeated phlebotomies
A: Is the least common type of human porphyria
Answer: A: Is the least common type of human porphyria 
Explanation: Porphyria cutanea tarda is the most common type of human porphyria and is associated with decreased activity of the enzyme uroporphyrinogen decarboxylase associated with a number of gene mutations.