This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neuro Ophthalmology, Subject name: Ophthalmology
A patient presented with complaints of diplopia. O/E pupils were dilated. Both direct and consensual light reflexes were lost. The diagnosis is : 
Select and explain. 
A. 2nd nerve palsy, B. 3rd nerve palsy, C. 5th nerve palsy, D. 7th nerve palsy
B: 3rd nerve palsy
Answer: B: 3rd nerve palsy 
Explanation: 3rd nerve palsy PUPILLARY LIGHT REFLEX :- If light enters an eye, the pupil of the same eye contracts (direct light reflex),activity shared equally by the pupil of other eye (consensual light reflex) - Afferent limb of light reflex is Optic nerve (CN2) and efferent limb is Oculomotor nerve (CN3) - Both direct and consensual light reflexes are lost in third nerve palsy.