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: Ophthalmology
Sling surgery should be avoided in cases of ptosis with: 
Select and explain. 
A. Very poor levator action, B. Poor Bell's phenomenon, C. Weak Muller's muscle, D. Multiple failed surgeries
B: Poor Bell's phenomenon
Answer: B: Poor Bell's phenomenon 
Explanation: Ans. Poor Bell's phenomenon