This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Diseases of Thyroid, Subject name: Medicine
[{'content': 'What is the most common cause of hypothyroidism world-wide? \nSelect and explain. \nA. Hashimoto thyroiditis, B. Subacute thyroiditis, C. Silent thyroiditis, D. Iodine deficiency', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Most common cause of hypothyroidism worldwide is IODINE DEFICIENCY In case of Iodine sufficiency most common cause of hypothyroidism : Autoimmune disease (Hashimoto Thyroiditis) and iatrogenic.', 'role': 'assistant'}]