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 maternal intake of: \nSelect and explain. \nA. Lithium, B. Copper, C. Cobalt, D. Nickel', 'role': 'user'}, {'content': "Answer: A \nExplanation: a. Lithium(Ref: Nelson's 20/e p 2211-2217, Ghai 8/e p 420-423)Maternal drugCongenital heart diseasePhenytoinVSD, ASD, coarctation of aorta, PDAValproateCoarctation of aorta, aortic stenosis, pulmonary atresia, VSDLithiumEbstein anomaly, Tricuspid atresiaAlcoholASD. VSD", 'role': 'assistant'}]