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: Anatomy
Serratus aerior is supplied by ? 
Select and explain. 
A. Thoracodorsal nerve, B. Axillary nerve, C. Musculocutaneous nerve, D. Nerve of bel 1
D: Nerve of bel 1
Answer: D: Nerve of bel 1 
Explanation: Ans. is 'd' i.e., Nerve of bell