This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S., Subject name: Pediatrics
[{'content': 'Ebstein anomaly is due to - \nSelect and explain. \nA. Lithium, B. Cu, C. Co, D. Ni', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Lithium o Ebstein anomalyDownward displacement of an abnormal tricuspid valve into right ventricle.Due to lithium exposure in intrauterine life.", 'role': 'assistant'}]