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
[{'content': "Egg on side appearance is seen in – \nSelect and explain. \nA. Fallot's tetralogy, B. Transposition of great vessels, C. Ebstein's anomaly, D. Ventricular septal defect", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]