This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: CNS Tumors, Subject name: Pathology
Which type of adenoma has the highest propensity to undergo dystrophic calcification? 
Select and explain. 
A. Somatotroph adenoma, B. Coicotroph adenoma, C. Lactotroph adenoma, D. Thyrotroph adenoma
C: Lactotroph adenoma
Answer: C: Lactotroph adenoma 
Explanation: Lactotroph adenomas have a propensity to undergo dystrophic calcification, ranging from isolated psammoma bodies to extensive calcification of viually the entire tumor mass ("pituitary stone").