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': "Decreased Radio iodine uptake is/are seen in -a) Toxic multinodular goiterb) Grave's diseasec) Subacute thyroiditisd) Factitious thyroiditis \nSelect and explain. \nA. ac, B. ad, C. cd, D. bd", 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]