<prompt> Which of the following cyanotic congenital heart disease is associated with increased risk of chest infections?Tetrology of FallotTricuspid atresiaTruncus arteriosusNone of these  <response>: Ans. C. Truncus arteriosusCyanotic congenital heart diseases associated with decrease in pulmonary blood flow are tetrology of Fallot TOF and tricuspid atresia TA. Cyanotic congenital heart diseases associated with increase in pulmonary blood flow are transposition of great arteries TGA, truncus arteriosus, total anomalous pulmonary venous return TAPVR, and hypoplastic left heart syndrome. Risk of chest infections are increased when pulmonary blood flow is increased. 