This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gastrointestinal Radiology, Subject name: Radiology
[{'content': 'Unilateral elevation of diaphragm is commonly due to \nSelect and explain. \nA. Obesity, B. Large Liver, C. Scoliosis, D. Congenital causes', 'role': 'user'}, {'content': "Answer: B \nExplanation: Causes of unilateral elevation of the dome of diaphragm: 1. Idiopathic 2. Eventration 3. Muscular disease 4. Radiation therapy 5. Neurologic disease (Stroke, polio) 6. Trauma, Erb's palsy", 'role': 'assistant'}]