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
Action of ciliary muscle: 
Select and explain. 
A. Constriction of pupil, B. Dilatation of pupil, C. Change in shape of lens, D. All of the above
C: Change in shape of lens
Answer: C: Change in shape of lens 
Explanation: Ciliary muscleIt is a ring of striated smooth muscle in the eye's middle layer (vascular layer)It controls accommodation for viewing objects at varying distances and regulates the flow of aqueous humour into Schlemm's canal.It changes the shape of the lens within the eye, not the size of the pupil which is carried out by the sphincter pupillae muscle.The muscle has only parasympathetic innervation.