This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urology, Subject name: Surgery
[{'content': 'Thyrotoxic myopathy affects ? \nSelect and explain. \nA. Muscles of the neck, B. Proximal limb muscles, C. Distal limb muscles, D. Muscles of the tongue', 'role': 'user'}, {'content': "Answer: B \nExplanation: Thyrotoxic myopathy affects proximal limb muscles i.e. the front thigh muscles, arm muscles. Weakness is more when muscle contracts isometrically either while getting down steps or lifting a full bucket. Once hypehyroidism is controlled, recovery occurs. Reference : page 473 SRB's manual of surgery 5th edition", 'role': 'assistant'}]