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: Pathology
Which of the following is not a feature of Peutz - Jegher Syndrome ? 
Select and explain. 
A. Mucocutaneous  pigmentation, B. Autosomal dominant, C. Hamartomatous polyp, D. Gain of function mutation of LKB1 / STK11
D: Gain of function mutation of LKB1 / STK11
Answer: D: Gain of function mutation of LKB1 / STK11 
Explanation: It is due to loss of function mutation of LKB1 / STK11