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
Causes of unilateral clubbing include all of the following, Except 
Select and explain. 
A. Congenital cyanotic hea disease, B. Panicoast tumor, C. Aoic Ancurym, D. Brachial AV fistulas
A: Congenital cyanotic hea disease
Answer: A: Congenital cyanotic hea disease 
Explanation: 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