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: Pharmacology
[{'content': 'Which of the following drugs is both effective and safe to use in a pregnant patient suffering from bipolar disorder ? \nSelect and explain. \nA. Carbamazepine, B. Lithium, C. Olanzapine, D. Valproic acid', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]