This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thyroid Gland, Subject name: Surgery
70 year old female with SNT shows increased RAI, Serum T3 and T4 are elevated. Most probable diagnosis is: 
Select and explain. 
A. Benign Colloid Nodule, B. Solitary Nodule, C. Follicular adenoma, D. Toxic Multinodular goiter
D: Toxic Multinodular goiter
Answer: D: Toxic Multinodular goiter 
Explanation: Ans. (d) Toxic multinodular goiterRef: Page 1531 Schwartz 10th edition Increased RAIU is seen in:* Graves' disease (Diffuse Toxic Goiter)* Toxic Multinodular goiter* Toxic adenoma* Drug induced - Amiodarone, Iodides* Cancer thyroid* Struma Ovarii* Hydatiform mole* TSH secreting Pituitary adenoma