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
All can cause recurrent pulmonary infection except: 
Select and explain. 
A. VSD, B. Recurrent LVF, C. TOF, D. ASD
C: TOF
Answer: C: TOF 
Explanation: Answer is C (TOF) ASD, L VF and VSD are all associated with pulmonary congestion and hence predispose to pulmonary infections. TOF is associated with reduced pulmonary blood flow (oligenic lung fields) due to right ventricular outflow obstruction and hence does not predispose to recurrent pulmonary infections.