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: Ophthalmology
[{'content': "Horner's syndrome is characterized by all of the following except: \nSelect and explain. \nA. Miosis, B. Enopthalmos, C. Ptosis, D. Cycloplegia", 'role': 'user'}, {'content': "Answer: D \nExplanation: Cycloplegia is not a feature of Horner's syndrome. Ref:Walsh and Hoyt's Clinical Neuro-Ophthalmology: The Essentials By Frank Buon Walsh, Nancy J. Newman, William Fletcher Hoyt, Neil R. Miller, Valerie Biousse, John B. Kerrison, 2007, Page 304", 'role': 'assistant'}]