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
Cause of unilateral clubbing include all the following except 
Select and explain. 
A. Congenital cyanotic hea disease, B. Panicoast tumor, C. Aoic aneurysm, D. Branchial AV fistulas
A: Congenital cyanotic hea disease
Answer: A: Congenital cyanotic hea disease 
Explanation: Congestive cyanotic hea disease is a causefor bilateral clubbing Ref Harrison 19th edition pg 250