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': 'The most common anomaly seen in the fetus of a mother taking lithium carbonate is – \nSelect and explain. \nA. Cardiac deformities, B. Neural tube defect, C. Limb reduction, D. Genitourinary deformities', 'role': 'user'}, {'content': 'Answer: A \nExplanation: It causes Ebstein anomaly.', 'role': 'assistant'}]