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': "A new born presents with deepening cyanosis at birth, with congestive heart failure and normal first heart sound. X–ray reveals cardiomegaly diagnosis is – \nSelect and explain. \nA. Tetralogy of fallot's, B. Ebstein anomally, C. Transposition of great vessels, D. Tricuspid atresia", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ebstein anomaly is a congenital malformation of the heart that is characterized by apical displacement of the septal and posterior tricuspid valve leaflets, leading to atrialization of the right ventricle with a variable degree of malformation and displacement of the anterior leaflet.', 'role': 'assistant'}]