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: Anatomy
[{'content': 'Cause of unilateral clubbing include all the following except \nSelect and explain. \nA. Congenital cyanotic hea disease, B. Panicoast tumor, C. Aoic aneurysm, D. Branchial AV fistulas', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Congestive cyanotic hea disease is a causefor bilateral clubbing Ref Harrison 19th edition pg 250', 'role': 'assistant'}]