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': 'The blood glucose level in diabetes mellitus is decreased by removal of the: \nSelect and explain. \nA. Thyroid, B. Parathyroids, C. Anterior pituitary, D. Posterior pituitary', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]