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
In which of the following differential cyanosis found? 
Select and explain. 
A. VSD with reversal of shunt, B. PDA with reversal of shunt, C. ASD with reversal of shunt, D. Tetralogy of Fallot
B: PDA with reversal of shunt
Answer: B: PDA with reversal of shunt 
Explanation: Ans. is 'b' i.e., PDA with reversal of shunt