This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Physiology
About CSF following statement (s) is/are true 
Select and explain. 
A. The dura is attached firmly to bone, B. CSF has a net weight of 1400g, C. Total volume of CSF is 150 ml, D. Daily production is 550 ml/day
B: CSF has a net weight of 1400g
Answer: B: CSF has a net weight of 1400g 
Explanation: CSF has a net weight of only 50 g In humans, the volume of CSF is about 150 mLThe rate of CSF production is about 550 mL/day. The dura is attached firmly to boneRef: Ganong's Review of Medical Physiology Twenty-Third Edition Page No: 572