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: Skin
Pigmented lesion in mouth and not in skin- 
Select and explain. 
A. Cushing syndrome, B. Cushing syndrome, C. Peutz Jegers, D. None of the above
D: None of the above
Answer: D: None of the above 
Explanation: Ans. is 'd' i.e., None of the above All of them are associated with oral as well as skin pigmentation.