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: Anatomy
[{'content': "Injury to cervical sympathetic trunk produces Horner's syndrome, that includes all, except \nSelect and explain. \nA. Anhydrosis, B. Enopthalmos, C. Ptosis, D. Mydriasis", 'role': 'user'}, {'content': "Answer: D \nExplanation: Injury to cervical Symphathetic trunk (which are formed by T1 to T4 fibres of spinal cord) produces Horner's syndrome. It is characterized by\n• ptosis (dropping of the upper eyelid)\n• miosis (constriction of pupil)\n• anhydrosis (loss of sweating)\n• enophthalmos (retraction of eye ball)", 'role': 'assistant'}]