<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 69-year-old woman is brought to the physician by her husband because of multiple falls and difficulty maintaining balance while standing or walking over the past year. During this period, she has had blurred vision and diplopia. Her husband has had difficulty understanding her speech for the past 3 months. She has become withdrawn and now refuses to go to social gatherings. Examination shows a broad-based gait and dysarthria. The visual acuity is 2020 in each eye. There is conjugate limitation of both eyes while looking down. Muscle tone is increased in bilateral upper extremities. Bradykinesia is present. Mental status examination shows apathy. She responds to questions with 12 words after a delay of several seconds. Grasp reflex is present. An MRI of the brain is most likely to show which of the following?? A: Atrophy of cerebellum and brainstem, B: Asymmetric focal cortical atrophy, C: Midbrain atrophy with intact pons, D: Frontal atrophy with intact hippocampi, E: Enlarged ventricles with mild cortical atrophy,  <response>: This is a clinical vignette describing a 69-year-old woman with a 1 year history of progressive gait instability, diplopia, dysarthria, withdrawal from social activities, increased muscle tone, bradykinesia, apathy, delayed speech, and grasp reflex on exam. She has intact visual acuity. The description of gait instability, dysarthria, bradykinesia, and increased muscle tone point towards a diagnosis of Parkinsons disease. MRI of the brain in Parkinsons disease classically shows loss of dopaminergic neurons in the substantia nigra of the midbrain, leading to atrophy of the midbrain.C: Midbrain atrophy with intact pons 