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: Surgery
[{'content': 'Kamli Rath 75 yrs old woman present with post-myocardial infarction after 6 weeks with mild CHF. There was past H/O neck surgery for parathyroid adenoma 5 years ago, EKG shows slow atrial fibrillation. Serum Ca+2  13.0 mg/L and urinary Ca2+ is 300 mg/ 24 hr. On examination, there is small mass in the Para tracheal position behind the right clavicle. Appropriate management at this time is - \nSelect and explain. \nA. Repeat neck surgery, B. Treatment with technetium - 99, C. Observation and repeat serum Ca+2 in two months, D. Ultrasound-guided alcohol injection of the mass', 'role': 'user'}, {'content': 'Answer: D \nExplanation: This patient operated previously for parathyroid adenoma, is having recurrent hyperparathyroidism.\nIn the setting of recent myocardial infarction, CHF and atrial fibrillation, any operation carries a high risk. Furthermore, an operation on a previously operated neck is quite difficult.\nAlcohol ablation of the mass with ultrasound guidance or angiographic embolization is preferred in this setting.', 'role': 'assistant'}]