<prompt> All except one is false regarding tetrology of fallotS2 in singleBlue TOF murmur is loudThese patients will develop congestive cardiac failure in near futureWith age proceeds to cardiomegaly  <response>: In TOF , there is no congestion due to pulmonary oligemia,. So these patients will never develop congestive cardiac failure or cardiomegaly. In blue TOF there is silent chest due to equalization of RV and LV pressure . 