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': 'Investigation of choice for evaluating pleural diseases: September 2011 \nSelect and explain. \nA. USG, B. Chest X-ray, C. CT scan, D. MRI', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C: CT scan CT displays pleural abnormalities more readily than either plain radiography or ultrasound, and may distinguish benign from malignant pleural disease', 'role': 'assistant'}]