<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 29-year-old woman comes to the physician because of poor balance and recurrent falls for the past month. She has also had blurry vision in her right eye for the past 2 weeks. She reports worsening of her symptoms after taking warm baths. Physical examination shows generalized hyperreflexia and an intention tremor. Romberg sign is positive. Visual acuity is 2050 in the left eye and 20100 in the right eye, and she is unable to distinguish red from green colors. The cells primarily affected by this patients condition are most likely derived from which of the following embryologic structures?? A: Mesoderm, B: Endoderm, C: Neuroectoderm, D: Neural crest, E: Notochord,  <response>: Based on the symptoms described in the question stem, this patient likely has multiple sclerosis, an autoimmune disease that affects the central nervous system. The key symptoms that point to MS are poor balance, recurrent falls, blurry vision, worsening after warm baths, hyperreflexia, intention tremor, and positive Romberg sign. MS causes demyelination of nerve fibers in the brain and spinal cord. The cells that produce myelin in the CNS are oligodendrocytes, which arise from neuroectoderm during embryonic development. Therefore, the cells primarily affected in MS originate from neuroectoderm.C: Neuroectoderm 