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: Ophthalmology
The volume of the orbit is about: 
Select and explain. 
A. 30 cc, B. 40 cc, C. 50 cc, D. 60 cc
A: 30 cc
Answer: A: 30 cc 
Explanation: Ans. 30 cc