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': 'Which of the following gland is known as a master of endocrine gland orchestra: \nSelect and explain. \nA. Pituitary gland., B. Hypothalamus, C. Thyroid gland., D. Adrenal gland.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: It is so called\xa0because, it controls thyroid, mammary glands, adrenal cortex and gonads etc.', 'role': 'assistant'}]