This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Medicine
Digital clubbing is seen in all except- 
Select and explain. 
A. Endocarditis, B. Pulmonary aeriovenous fistula, C. Tricuspid atresia, D. Aoic dissection
B: Pulmonary aeriovenous fistula
Answer: B: Pulmonary aeriovenous fistula 
Explanation: Tricuspid atresia symptoms in children include: Cyanosis: a blue or purple tint to lips, skin and nails. Hea murmur: the hea sounds abnormal when a doctor listens with a stethoscope. .Abnormal shape of the fingeips ("clubbing") in older children. Finger clubbing is seen in aoic dissection Ref Davidson 23rd edition pg 465