This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
[{'content': 'Order of structures in Porta hepatis are \nSelect and explain. \nA. = Right anterior - Portal vein ;  = Posterior hepatic artery ;  = Left anterior - Bile duct, B. = Right anterior - Bile duct ;  = Posterior - Hepatic artery ;  = Left anterior - Portal vein, C. = Right anterior - Portal vein ;  = Posterior - Bile duct ;  = Left anterior - hepatic artery, D. = Right anterior - Hepatic artery ;  = Posterior -Posterior Vein ;  = left anterior - Bile duct', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Arrangement of structures at Porta hepatis from anterior to posterior\n =\xa0Bile duct\xa0\n\xa0= Hepatic artery\n =\xa0Portal vein', 'role': 'assistant'}]