This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Liver & Biliary Tract, Subject name: Pathology
[{'content': '25/M presented with jaundice, clay coloured stool and pruritus. Bilirubin was 7gm%, Direct Bilirubin 5gm%, ALP 500 IU/L. Biopsy from biliary tract revealed the following. What is your diagnosis? \nSelect and explain. \nA. PSC, B. SBC, C. PBC, D. Bile duct stones', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) PSC* Clinical feature of jaundice, clay coloured stool and pruritus is suggestive of obstructive jaundice. Biopsy showing fibrotic obliteration of bile ducts ("onionskin" fibrosis) seen in primary biliary cirrhosis.', 'role': 'assistant'}]