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
[{'content': "Policeman’s tip hand is seen in \nSelect and explain. \nA. Erb's palsy, B. Klumpke’s paralysis, C. Axillary nerve injury, D. None of the above", 'role': 'user'}, {'content': "Answer: A \nExplanation: ERB'S PARALYSIS:-\nupper plexus injury.\nCaused 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.\nInvolves upper trunk - C5, C6 roots.\nLeads 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.\n1. Adduction of arm due to deltoid paralysis.\n2. Medial rotation of arm-paralysis of supraspinatus, infraspinatus and teres minor.\n3. Extension of elbow- paralysis of biceps brachii\n4. Pronation of forearm- paralysis of biceps brachi\n5. Loss of sensation over outer aspect of arm due to C6 spinal nerve involvement.", 'role': 'assistant'}]