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: Medicine
Following is true regarding cerebral venousinusesa) Transverse sinus is unequalb) CVT causes enophthalmosc) CVT causes empty delta signd) Communicate with subdural space 
Select and explain. 
A. ac, B. bc, C. ad, D. b
A: ac
Answer: A: ac 
Explanation: None