This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Abdominal wall ,Inguinal and Femoral region, Subject name: Anatomy
[{'content': 'Flexors of lumbar spine are all EXCEPT: \nSelect and explain. \nA. Erector spinae, B. External oblique muscle, C. Internal oblique muscle, D. Rectus abdominis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Forward flexors: Rectus abdominis, external abdominal oblique, internal abdominal obliques, transversus abdominis and iliacus-psoas. Lateral flexors: Ipsilateral contraction of the oblique and transversus abdominal muscles and quadratus lumborum.', 'role': 'assistant'}]