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: Dental
The extraction of upper first molars may be indicated: 
Select and explain. 
A. When the removal of 4/4 provides insufficient space, B. Where they are rotated, C. When their prognosis is poor, D. When 5/5 are palatally placed
C: When their prognosis is poor
Answer: C: When their prognosis is poor 
Explanation: Key concept:
Any teeth which is having poor prognosis is indicated for extraction.