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 centers are involved in maintaining the circadian rhythm? \nSelect and explain. \nA. Supraoptic nuclei, B. Posterolateral nuclei, C. Ventrolateral nuclei, D. Suprachiasmatic nuclei', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The entrainment process in most cases is dependent on the suprachiasmatic nuclei (SCN) located bilaterally above the optic chiasma. Efferents from the SCN initiate neural and hormonal signals that enteain a wide variety of well known circadian rhythms including the sleep wake cycle and the secretion of the pineal hormone melatonin.', 'role': 'assistant'}]