This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pediatrics
[{'content': 'Which of the following is the most common congenital cardiac defect? \nSelect and explain. \nA. TOF, B. Transposition of great aeries, C. Ventricular septal defect, D. Atrial septal defect', 'role': 'user'}, {'content': "Answer: C \nExplanation: VSD is the most common congenital hea diseaseTOF is the commonest cyanotic congenital hea disease(Refer: Nelson's Textbook of Pediatrics, SAE, 1st edition, pg no. 2194 - 2195)", 'role': 'assistant'}]