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
False about Horner's syndrome 
Select and explain. 
A. Lack of sympathetic innervation, B. Loss of ciliospinal reflex, C. Horner's pupil dilates with topical cocaine, D. Confirmatory tests; dilation lag and cocaine test
C: Horner's pupil dilates with topical cocaine
Answer: C: Horner's pupil dilates with topical cocaine 
Explanation: In cocaine test - normal pupil dilates whereas Horner's pupil doesnot.