This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pharmacology
[{'content': 'Pain in early labor is transmitted through \nSelect and explain. \nA. T11 - T12, B. L2 - L3, C. L4 - L5, D. S2 - S3', 'role': 'user'}, {'content': 'Answer: A \nExplanation: .', 'role': 'assistant'}]