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: Medicine
[{'content': 'A patient presents with headache, intermittent claudication and dizziness. Which of the following may be the underlying cause - \nSelect and explain. \nA. Tetrology of Fallot, B. Coarctation of aorta, C. Patent ductus arteriosus, D. Atrial septal defect', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]