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
[{'content': 'Which of the following is not true regarding glomus tumor \nSelect and explain. \nA. 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', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Glomus tumor is very painful tumor.', 'role': 'assistant'}]