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: Anatomy
[{'content': 'Which of the following do NOT elevate the ribs - \nSelect and explain. \nA. Serratus posterior superior, B. Serratus posterior inferior, C. External intercostals, D. Levatores costarum', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Muscles that elevate the ribs are the muscles of inspiration. Serratus posterior inferior is a muscle of expiration.', 'role': 'assistant'}]