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
[{'content': "Cyanosis is NOT present in: March 2013 \nSelect and explain. \nA. TGA, B. PDA with pulmonary aerial hypeension, C. COA, D. Ebstein's anomaly", 'role': 'user'}, {'content': 'Answer: C \nExplanation: 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', 'role': 'assistant'}]