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 true regarding glomus tumor 
Select and explain. 
A. Benign tumor of glomus body, B. Most common site is distal phalanges, C. Usually asymptomatic produces pain if undergoes malignant change, D. It is a tumor of modified smooth muscle cells
C: Usually asymptomatic produces pain if undergoes malignant change
Answer: C: Usually asymptomatic produces pain if undergoes malignant change 
Explanation: Glomus tumor is very painful tumor.