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
Nerve commonly involved in fracture distal shaft of the Humerus - 
Select and explain. 
A. Radial nerve, B. Medial, C. Ulnar, D. Circumflex brachial nerve
A: Radial nerve
Answer: A: Radial nerve 
Explanation: Radial nerve is the most commonly injured nerve in fracture shaft humerus. It is particularly common in oblique fractures at the junction of middle and distal third bone ( Hoistein-lewis fracture)