<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 45-year-old executive travels frequently around the world. He often has difficulty falling asleep at night when he returns home. You suspect a circadian rhythm disorder is responsible for his pathology. Which of the following regulates the circadian rhythm?? A: Anterior hypothalamus, B: Posterior hypothalamus, C: Ventromedial area of hypothalamus, D: Supraoptic area of hypothalamus, E: Suprachiasmatic nucleus of hypothalamus,  <response>: This is a question about the regulation of circadian rhythm. The circadian rhythm is the roughly 24-hour cycle in biochemical, physiological, and behavioral processes in humans. Disruptions to this rhythm can cause sleep disorders. The question stem describes a patient with difficulty sleeping after traveling across time zones, suggesting a circadian rhythm disorder. The choices list different parts of the hypothalamus, which is known to be involved in regulation of circadian rhythms.To answer the question, we need to identify which specific part of the hypothalamus contains the master circadian pacemaker that drives circadian rhythms. E: Suprachiasmatic nucleus of hypothalamus 