This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Liver, Subject name: Surgery
[{'content': 'Most common cause of pyogenic liver abscess: \nSelect and explain. \nA. Aspiration, B. Hematogenous spread from a distant site, C. Direct contact, D. Lymphatic spread', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (b) Hematogenous spread from a distant site* 1st Common route - Biliary Ascending* 2nd Common route - Portal vein route* 3rd Common route - Hepatic artery', 'role': 'assistant'}]