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': 'Causes of unilateral clubbing include all of the following, Except \nSelect and explain. \nA. Congenital cyanotic hea disease, B. Panicoast tumor, C. Aoic Ancurym, D. Brachial AV fistulas', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Answer is A (Congenital Cyanotic Hea Disease) : Congenital cyanotic hea disease is a cause for bilateral clubbing Causes of Unilateral Clubbing Aneurysm of Aoa, innonimate aery, suhclan aery or axillary aery Brachial AV fistulas / malformations Infected aerial grafts Pancoast tumors Unilateral Elythromelalgia', 'role': 'assistant'}]