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: ENT
Glomus tumor invading the veical pa of carotid canal. It is ? 
Select and explain. 
A. Type B, B. Type CI, C. Type C2, D. Type C3
C: Type C2
Answer: C: Type C2 
Explanation: Ans. is `c' i.e., Type C2