<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 17-year-old boy is brought to the physician with complaints of an ataxic gait and hearing deficits for the past few days. His parents also reported a history of tonic gaze deviation on the right side and the spontaneous remission of a similar episode 6 months ago. His temperature is 37C 98.6F, pulse is 88min, and respirations are 20min. On physical examination, no abnormality is found, but evoked potential tests are abnormal. Magnetic resonance imaging of the head shows multiple lesions with high T2 signal intensity and one large white matter lesion showing contrast enhancement. His laboratory studies show:Hemoglobin 12.9 gdLCSF leukocyte count 1000μLCSF gamma globulin 15.4 normal 714Erythrocyte sedimentation rate 16 mmhWhich of the following most likely explains the mechanism of this condition?? A: Type I hypersensitivity, B: Type II hypersensitivity, C: Type III hypersensitivity, D: Type IV hypersensitivity, E: Type V hypersensitivity,  <response>: This is a clinical case scenario describing a 17-year-old boy with complaints of ataxic gait, hearing deficits, tonic gaze deviation, and history of similar episodes. The findings on MRI of multiple lesions in the brain with high T2 signal intensity and contrast enhancement along with CSF analysis showing elevated leukocyte count and gamma globulins suggest an inflammatory demyelinating disease of the central nervous system. The question asks to identify the most likely mechanism for this condition out of the 5 types of hypersensitivity reactions. Based on the clinical and investigative findings, this scenario is most consistent with type IV or cell-mediated hypersensitivity leading to inflammatory demyelination in the brain.D: Type IV hypersensitivity 