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
A patient Mohan, aged 60 years, needs an eye examination. He needs a drug which will dilate his eyes but not paralyse his ciliary muscles – 
Select and explain. 
A. Atropine, B. Phenylephrine, C. Cyclopentolate, D. Tropicamide
B: Phenylephrine
Answer: B: Phenylephrine 
Explanation: Cycloplegics cause paralysis of accommodation and dilate the pupil → Atropine, homatropine, Cyclopentolate.
Only mydriatic (dilate pupil) but no cycloplegia →   Phenylephrine.