This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Physiology
[{'content': 'The level of which hormone is unchanged in pregnancy \nSelect and explain. \nA. Prolactin, B. Growth hormone, C. ACTH, D. Plasma vasopressin', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The levels of ACTH, CRR, and Prolactin increase; the level of GH increases during pregnancy due to its variant syncytiotrophoblast. Plasma vasopressin levels remain unchanged', 'role': 'assistant'}]