This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Drugs in Pregnancy, Subject name: Gynaecology & Obstetrics
[{'content': 'Most common anomaly seen in fetus of mother taking lithium carbonate is: \nSelect and explain. \nA. Genitourinary deformity, B. Limb reduction, C. Neural tube defect, D. Cardiac deformities', 'role': 'user'}, {'content': "Answer: D \nExplanation: Lithium effect on pregnant women: Lithium should not be used during pregnancy, especially in the first trimester, because of possible teratogenicity. It is known to cause Ebstein's anomaly, a cardiac abnormality. It is characterized by apical displacement of the tricuspid valve , often resulting in severe tricuspid regurgitation and marked RA enlargement .", 'role': 'assistant'}]