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: Physiology
[{'content': 'In which of the following form the Anti diuretic hormone (ADH) is circulated in plasma : \nSelect and explain. \nA. Bound to neurophysin-I, B. Bound to neurophysin-II, C. Bound to plasma albumin, D. Free form', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D i.e. Free form', 'role': 'assistant'}]