This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cyanotic Congenital Heart Disease, Subject name: Pediatrics
Which of the following is most common type of congential cardiac cyanotic anamoly? 
Select and explain. 
A. Tetralogy of Fallot, B. TAPVC, C. Transposition of great vessels, D. Ebstein's Anamoly
A: Tetralogy of Fallot
Answer: A: Tetralogy of Fallot 
Explanation: Ans. is 'a' i.e., Tetralogy of Fallot o TOF is the commonest cyanotic congenital heart disease.