<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:An 8-year-old boy is brought to the physician by his mother because of a 3-week history of irritability and frequent bed wetting. She also reports that he has been unable to look upward without tilting his head back for the past 2 months. He is at the 50th percentile for height and weight. His vital signs are within normal limits. Ophthalmological examination shows dilated pupils that are not reactive to light and bilateral optic disc swelling. Pubic hair development is Tanner stage 2. The most likely cause of this patients condition is a tumor in which of the following locations?? A: Cerebral falx, B: Dorsal midbrain, C: Fourth ventricle, D: Sella turcica, E: Cerebellar vermis,  <response>: This is a clinical vignette describing a pediatric patient with symptoms of irritability, bed wetting, inability to look upward without tilting the head back, dilated non-reactive pupils, and optic disc swelling. The key findings are:- 8 year old boy - 3 weeks of irritability and bed wetting- 2 months of inability to look upward without tilting head back - Dilated non-reactive pupils - Bilateral optic disc swelling- Tanner stage 2 pubic hair development This constellation of symptoms and findings localizes to a lesion in the dorsal midbrain affecting cranial nerves II optic and III oculomotor. The dorsal midbrain contains the cerebral aqueduct. A tumor in this location can cause obstructive hydrocephalus leading to increased intracranial pressure, which can cause the ocular findings, irritability, and bed wetting. Tanner stage 2 pubic hair development indicates early but normal pubertal development, not suggestive of a pituitary tumor. The other answer choices do not fit with the localization.B: Dorsal midbrain 