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: Radiology
[{'content': 'Widening of C loop of duodenum is a feature of: \nSelect and explain. \nA. Pancreatic head growth, B. Carcinoma stomach, C. Splenic involvement, D. Involvement of upper renal pole', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Pancreatic Head Growth On barium meal, the loop of duodenum is widenedQ also k/a Pad Sign in cases of carcinoma head of pancreas.', 'role': 'assistant'}]