This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fluid and electrolytes, Subject name: Medicine
Hyponatremia is seen in 
Select and explain. 
A. Hypehyroidism, B. Hypothyroidism, C. DM, D. Increased insensible loss
B: Hypothyroidism
Answer: B: Hypothyroidism 
Explanation: Hypothyroidism is one of the causes of hyponatremia, thus thyroid-stimulating hormone determination is mandatory during the evaluation of patients with reduced serum sodium levels. .Patients with moderate to severe hypothyroidism and mainly patients with myxedema may exhibit reduced sodium levels (<135 mmol/L) Ref Davidson 23rd edition pg 370