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: Surgery
Which is not the component of carneys traid 
Select and explain. 
A. GIST, B. Pulmonary chondromas, C. Osteoma, D. Extra adrenal paraganglioma
C: Osteoma
Answer: C: Osteoma 
Explanation: None