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: Medicine
Cyanosis is NOT present in: March 2013 
Select and explain. 
A. TGA, B. PDA with pulmonary aerial hypeension, C. COA, D. Ebstein's anomaly
C: COA
Answer: C: COA 
Explanation: Ans. C i.e. COA Differential cyanosis (cyanosis in toes but NOT in fingers) is characteristic of PDA with pulmonary aerial hypeension and right to left shunt