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: Surgery
Penrose drain is 
Select and explain. 
A. Simple rubber tube opens at one end, B. Simple rubber tube opens at both ends, C. Modified corrugated rubber drain, D. Modified Foley's Catheter
B: Simple rubber tube opens at both ends
Answer: B: Simple rubber tube opens at both ends 
Explanation: None