This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Medicine
[{'content': 'Sequestration lung is best diagnosed by- \nSelect and explain. \nA. CT. scan, B. M.R.I., C. Barium swallow, D. Angiography', 'role': 'user'}, {'content': 'Answer: D \nExplanation: A pulmonary sequestration (bronchopulmonary sequestration)is a medical condition wherein a piece of tissue that ultimately develops into lung tissue is not attached to the pulmonary aerial blood supply.An angiogram/aeriogram has been considered vital in documenting the systemic blood supply,allowing definitive diagnosis as well as preoperative planning.', 'role': 'assistant'}]