<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:An 18-year-old man presents to his primary care physician with a complaint of excessive daytime sleepiness. He denies any substance abuse or major changes in his sleep schedule. He reports frequently dozing off during his regular daily activities. On further review of systems, he endorses falling asleep frequently with the uncomfortable sensation that there is someone in the room, even though he is alone. He also describes that from time to time, he has transient episodes of slurred speech when experiencing heartfelt laughter. Vital signs are stable, and his physical exam is unremarkable. This patient is likely deficient in a neurotransmitter produced in which part of the brain?? A: Thalamus, B: Pons nucleus, C: Hippocampus, D: Hypothalamus, E: Midbrain,  <response>: This is a clinical vignette describing a patient with symptoms of excessive daytime sleepiness, cataplexy loss of muscle tone triggered by emotions, and hypnagogic hallucinations. The key findings are excessive daytime sleepiness not explained by sleep deprivation or substance use, cataplexy triggered by laughter, and hypnagogic hallucinations. This constellation of symptoms is classic for narcolepsy type 1, which is caused by hypocretinorexin deficiency. Hypocretinorexin is a neurotransmitter produced by neurons in the hypothalamus. Therefore, the answer is hypothalamus.D: Hypothalamus 