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
Poor accessibility is the main disadvantage of _______ flap 
Select and explain. 
A. Trapezoid, B. Envelope, C. Semilunar, D. Any of the above
C: Semilunar
Answer: C: Semilunar 
Explanation: None