This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thorax, 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: Serratus posterior inferior does not elevate the ribsB D CHAURASIA&;S HUMAN ANATOMY UPPER LIMB THORAX-VOLUME1 SIXTH EDITION Page-44', 'role': 'assistant'}]