This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Rectum and anal canal, Subject name: Surgery
Fascial layer separating the rectum from the coccyx is? 
Select and explain. 
A. Denonvilliers' fascia, B. Scarpa's fascia, C. Buck's fascia, D. Waldeyer's fascia
D: Waldeyer's fascia
Answer: D: Waldeyer's fascia 
Explanation: Lower third of the rectum is separated anteriorly from the prostate/vagina by- Denonvilliers' fascia Posteriorly from the coccyx and lower two sacral veebrae by- Waldeyer's fascia These fascial layers act as barriers to malignant invasion