This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
[{'content': 'Horner’s syndrome involves all except \nSelect and explain. \nA. Ptosis, B. Exopthalmos, C. Anhidrosis, D. Loss of cilio-spinal reflex', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Horner’s syndrome is caused by damage to the sympathetic trunk.\nThe symptoms occur on the same side as the lesion of the sympathetic trunk.\nIt is characterized by\n\n\nMiosis (a constricted pupil),\nPtosis (drooping of eyelids due to weakness of superior tarsal muscle which is a part of levator palpebrae superioris)\nApparent enophthalmos (ptosis due to weakness of orbicularis oculi makes it appear that the eyes are sunken in\xa0enophtalmos, exophthalmos doesn’t occur in Horner’s syndrome),\nAnhidrosis (decreased sweating) and\nLoss of cilio-spinal reflex (pinching nape of neck leads to pupillary dilation).', 'role': 'assistant'}]