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
Hypothyroidism in sub-Himalayan is due to 
Select and explain. 
A. Iodine, B. Iron, C. Copper, D. Selenium
A: Iodine
Answer: A: Iodine 
Explanation: 'Iodine deficiency in sub-Himalayan terrain leads to endemic goitre and hypothyroidism”