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: Orthopaedics
During fixation of Bennett's fracture, which muscle hinders it : 
Select and explain. 
A. Extensor pollicis brevis, B. Flexor pollicis brevis, C. Flexor pollicis longus, D. Abductor pollicis longus
D: Abductor pollicis longus
Answer: D: Abductor pollicis longus 
Explanation: Following are the deforming forces in Bennett's fracture :

At the distal fragment, it is the adductor pollicis.
At the proximal fragment, it is the abductor pollicis longus.