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: Pediatrics
All of the following are characteristic features of tetralogy of Fallot (TOF), 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: Five features are characteristic for tetralogy of Fallot (TOF): VSD RVH RV outflow obstruction from infundibular stenosis Overriding aoa in half (< 50% of the aoa over the septum) A right-sided aoic arch is seen in 25% There may or may not be pulmonary valve stenosis as well, usually due to a bicuspid pulmonary valve. Ref: Bashore T.M., Granger C.B., Hranitzky P., Patel M.R. (2013). Chapter 10. Hea Disease. In M.A. Papadakis, S.J. McPhee, M.W. Rabow (Eds), CURRENT Medical Diagnosis & Treatment 2013.