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': 'Differential cyanosis is seen in: \nSelect and explain. \nA. ASD, B. VSD, C. PDA, D. All of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Answer is C (PDA) Differential cyanosis is a characteristic feature of Patent ductus aeriosus', 'role': 'assistant'}]