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
Policeman’s tip hand is seen in 
Select and explain. 
A. Erb's palsy, B. Klumpke’s paralysis, C. Axillary nerve injury, D. None of the above
A: Erb's palsy
Answer: A: Erb's palsy 
Explanation: ERB'S PARALYSIS:-
upper plexus injury.
Caused by forceful widening of the angle between the head and shoulder which may occur by traction of arm during the birth of a child or by fall on the shoulder.
Involves upper trunk - C5, C6 roots.
Leads to typical deformity in the limb- policeman's tip hand/ porter's tip hand. The arm hangs by the side, adducted and medially rotated, forearm is extended and pronated.
1. Adduction of arm due to deltoid paralysis.
2. Medial rotation of arm-paralysis of supraspinatus, infraspinatus and teres minor.
3. Extension of elbow- paralysis of biceps brachii
4. Pronation of forearm- paralysis of biceps brachi
5. Loss of sensation over outer aspect of arm due to C6 spinal nerve involvement.