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: Physiology
Mydriasis is due to 
Select and explain. 
A. Relaxation of ciliary muscle, B. Relaxation of radial muscle, C. Contraction of ciliary muscle, D. Contraction of radial muscles
D: Contraction of radial muscles
Answer: D: Contraction of radial muscles 
Explanation: None