This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Medicine
A 40 year old women presented with a CT scan of head showing an enlarged sellatursica. Neurological and endocrine work up in detail were found to be normal. The most likely diagnosis is- 
Select and explain. 
A. Prolactinoma, B. Chromophobe adenoma, C. Craniophobe, D. Empty sella syndrome
D: Empty sella syndrome
Answer: D: Empty sella syndrome 
Explanation: in empty Sella syndrome , patient usually have normal pituitary function , implying that surrounding rim of pituitary tissue is fully functional ( Harrison 17 pg 2199)