This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology and breast, Subject name: Surgery
[{'content': 'Indication for surgery in a case of adrenal incidentaloma is \nSelect and explain. \nA. >2cm, B. >3cm, C. >4cm, D. >5cm', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Any non-functioning adrenal tumour greater than 4 cm in diameter and smaller tumours that increase in size over time should undergo surgical resection. Non-functioning tumours smaller than 4 cm should be followed-up after 6, 12 and 24 months by imaging (MRI) and hormonal evaluationRef: Bailey and Love 27e pg: 840', 'role': 'assistant'}]