This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ocular motility and squint, Subject name: Ophthalmology
Dilator pupillae is supplied by - 
Select and explain. 
A. Post-ganglionic parasympathetic fibers from Edinger Westphal nucleus, B. Post-ganglionic sympathetic fibers from cervical sympathetic chain, C. IIIrd nerve, D. Sympathetic fibers from fronto-orbital branch of V nerve
B: Post-ganglionic sympathetic fibers from cervical sympathetic chain
Answer: B: Post-ganglionic sympathetic fibers from cervical sympathetic chain 
Explanation: Dilator pupillae muscle is suppliedby the postganglionic fibers arising from the cervical sympathetic chain. ... Oculomotor nerve supplies the skeletal as well as the smooth muscles of the eyeball. It carries the pre-ganglionic fibers from the Edinger-Westphal to supply two smooth muscles in the eyeball Ref AK khurana 6/e