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
Most common cause of neurological deficit in upper limb is - 
Select and explain. 
A. Polio, B. Erb's palsy, C. C1-C2 dislocation, D. Fracture dislocation of cervical spine
B: Erb's palsy
Answer: B: Erb's palsy 
Explanation: None