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: Surgery
[{'content': 'Most common symptom of CA head of pancreas \nSelect and explain. \nA. Vomiting, B. Pain, C. Malabsorption, D. Jaundice', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Jaundice is the most common symptom of Ca. Head of pancreas.', 'role': 'assistant'}]