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: Medicine
Third nerve palsy with pupillary sparing is seen in-a) Hypertensionb) Aneurysm of posterior communicating arteryc) Diabetes mellitusd) Craniopharyngioma 
Select and explain. 
A. a, B. bc, C. ad, D. ac
D: ac
Answer: D: ac 
Explanation: None