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
[{'content': 'Which of the following is in anterior relation to the head of pancreas? \nSelect and explain. \nA. Common bile duct, B. Gastroduodenal aery, C. Inferior vena cava, D. Aoa', 'role': 'user'}, {'content': 'Answer: B \nExplanation: .', 'role': 'assistant'}]