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': 'Hypothyroidism in sub-himlayan region is due to deficiency of \nSelect and explain. \nA. Iron, B. Iodine, C. Copper, D. Selenium', 'role': 'user'}, {'content': "Answer: B \nExplanation: Answer is B (Iodine): Hypothyroidism (and Endemic Goitre) in sub-himalayan region is primarily due to deficiency of iodine. 'Dietary iodine deficiency is widely prevalent in many pas of India, especially the sub-Himalayan region and is the principal cause of endemic goiter. Where the deficiency is severe, goiter, hypothyroidism and endemic cretinism is common'-'Pediatrics: A concise Test' by kabra Elsevier 2007/2 The most common cause of neonatal hypothyroidism (congenital hypothyroidism) is thyroid gland dysgenesis (80-85%). The most common of endemic goiter/hypothyroidism is iodine deficiency.", 'role': 'assistant'}]