This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Medicine
Hung up ankle reflex seen in - 
Select and explain. 
A. Hypothyroidism, B. Thyrotoxicosis, C. Sipple syndrome, D. Wermer syndrome
A: Hypothyroidism
Answer: A: Hypothyroidism 
Explanation: Hung up reflex is a deep tendon reflex in which, after a stimulus is given and the reflex action takes place, the limb slowly returns to its neutral position. This prolonged relaxation phase is characteristic of reflexes in persons with hypothyroidism. It is also known as Woltman sign. In unaffected patients, the relaxation time for deep tendon reflexes is 240-320 ms. Delays in relaxation time in patients with hypothyroidism appears to be propoional to the level of thyroid-hormone deficiency.