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
Essential criteria for TOF includes all except 
Select and explain. 
A. Valvular stenosis, B. Infundibular stenosis, C. Over riding of aoa, D. RVH
A: Valvular stenosis
Answer: A: Valvular stenosis 
Explanation: The four components of the tetralogy of Fallot are malaligned VSD, obstruction to RV outflow, aoic override of the VSD, and RV hyperophy due to the RV's response to aoic pressure the large VSD. ( Harrison&;s principle of internal medicine,18th edition,pg no. 1926 )