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
[{'content': 'Digital clubbing is seen in all except- \nSelect and explain. \nA. Endocarditis, B. Pulmonary aeriovenous fistula, C. Tricuspid atresia, D. Aoic dissection', 'role': 'user'}, {'content': 'Answer: B \nExplanation: 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', 'role': 'assistant'}]