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: Medicine
[{'content': 'Two years ago, a 30-year old lady had undergone near total thyroidectomy for papillary carcinoma. During the follow up visits, she was found to have multiple, discrete, mobile, left, deep cervical lymph nodes measuring 1 to 1.5 cms in size. the ideal treatment for this lady would be - \nSelect and explain. \nA. Iodine 131 ablation, B. External irradiation to the neck, C. Thyroxine therapy, D. Modified redical neck dissection', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]