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
Characteristics of diabetic 3rd nerve palsy may include all except 
Select and explain. 
A. Pain, B. Normal pupils, C. Recovery within 6 months, D. Aberrant regeneration
D: Aberrant regeneration
Answer: D: Aberrant regeneration 
Explanation: Aberrant regeneration(oculomotor synkinesis) occurs after traumatic lesions and not after Diabetic third nerve palsy. 'Medical' lesions such as occur in HTN and DM usually spare pupil. This is because the microangiopathy involves vasa nervorum, causing ischaemia of main trunk of nerve, leaving the superficial pupillary fibres intact. Thus there is normal pupillary reaction. Location of pupillomotor fibres is within the trunk of 3rd nerve Patients may also have pain and lesion recovers in 6 months.