This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Diseases of orbit, Lids and lacrimal apparatus, Subject name: Ophthalmology
[{'content': "Horner's syndrome, all are true except- \nSelect and explain. \nA. Unilateral loss of sweating, B. Enophthalmos, C. Mydriasis, D. Ptosis", 'role': 'user'}, {'content': 'Answer: C \nExplanation: MIOSIS occurs not mydriasis . Unilateral loss of sweating,Ptosis,Enophthalmos Heterochromia iridis , loss of ciliospinal reflex. Ref : ak khurana 6th edition', 'role': 'assistant'}]