This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General Surgery, Subject name: Surgery
The following is a thyroid scan. The most probable diagnosis can be: 
Select and explain. 
A. Papillary carcinoma thyroid, B. Lateral aberrant thyroid, C. Hypersecreting adenoma, D. Graves disease
C: Hypersecreting adenoma
Answer: C: Hypersecreting adenoma 
Explanation: The given thyroid scan is showing increased focal uptake in the Rt upper lobe of thyroid & decreased uptake in the rest of the thyroid gland, this is suggestive of hypersecreting thyroid adenoma. There is no ectopic thyroid tissue, so lateral aberrant thyroid & lateral extension is ruled out. Malignancy ruled out as there is no cold nodule.