This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Upper Limb and Lower Limb, Subject name: Anatomy
[{'content': 'All of the following are the contents of second layer of sole except:- \nSelect and explain. \nA. Flexor hallucis longus, B. Flexor digitorum longus, C. Flexor digitorum accessorius, D. Flexor hallucis brevis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Second layer of sole consist of two extrinsic tendons flexor hallucis longus & flexor digitorum longus and two intrinsic muscles flexor digitorum accessorius & four lumbricals. Flexor hallucis brevis is the muscle of third layer.', 'role': 'assistant'}]