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
Which of the following is false about Nelson’s syndrome 
Select and explain. 
A. skin pigmentation, B. Pituitary tumor, C. High ACTH  levels, D. None of the above
D: None of the above
Answer: D: None of the above 
Explanation: None