<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 56-year-old man with a significant past medical history of diabetes mellitus, hypertension, and hypercholesterolemia is brought to the emergency department by his wife. The wife states the symptoms started 1 hour ago when she noticed that he was having difficulty swallowing his breakfast and that his voice was hoarse. The patient had a recent admission for a transient ischemic attack but was not compliant with his discharge instructions and medication. Examination of the eye shows left-sided partial ptosis and miosis along with diplopia and nystagmus. During the examination, it is noted that the right side of the face and body has markedly more sweating than the left side. An MRI of the brain reveals an ischemic infarct at the level of the left lateral medulla. Which of the following most likely accounts for this patients symptoms?? A: 3rd-order neuron lesion, B: Denervation of the descending sympathetic tract, C: Preganglionic lesion at the lateral gray horn, D: Postganglionic sympathetic lesion, E: Injury to the cervical sympathetic ganglia,  <response>: Based on the patients symptoms of difficulty swallowing, hoarse voice, left-sided ptosis, miosis, diplopia, and nystagmus, as well as decreased sweating on the left side of the face and body, this appears to be a case of lateral medullary syndrome, also known as Wallenberg syndrome. The MRI finding of an ischemic infarct in the left lateral medulla supports this. The key finding is the decreased sweating on the left side of the body, indicating a sympathetic deficit. This localizes the lesion to the descending sympathetic tracts in the lateral medulla. Choices A and C can be eliminated, as this is a lesion of the lateral medulla, not a 3rd order neuron or preganglionic neuron. Choice D can also be eliminated, as this is not a postganglionic lesion. Choice E refers to the cervical sympathetic ganglia, which would cause a Horners syndrome with ptosis, miosis, and facial anhydrosis, but would not explain the other brainstem findings or the decreased sweating on the left side of the body.Therefore, choice B, denervation of the descending sympathetic tract in the lateral medulla, is the most likely explanation for this patients symptoms.B: Denervation of the descending sympathetic tract 