a 5 yr old child develops cyanosis with minimal exertion and frequently assumes squatting position,on medical evaluation, he is found to hv enlarged RT ventricle which of the following early developmental events most likely underlies this condition?
A) abnormal neural crest migration
B) endocardial cushion defect
C) aortic arch constriction
D) pulmonary HT
E) abnormal primitive heart tube looping
A) abnormal neural crest migration
B) endocardial cushion defect
C) aortic arch constriction
D) pulmonary HT
E) abnormal primitive heart tube looping