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
[{'content': 'A patient involved in a road traffic accident presents with quadriparesis, sphincter disturbance, sensory level up to the upper border of the sternum and a respiratory rate of 35/minute. The likely level of lesion is - \nSelect and explain. \nA. CI-C2, B. C4- C5, C. T1 - T2, D. T3 - T4', 'role': 'user'}, {'content': 'Answer: B \nExplanation: First, see the sensory distribution of the lower neck & upper trunk.\nC2 dermatome →Occiput & top part of the neck.\nC3 dermatome → Lower part of neck upto the clavicle.\nC4 dermatone →Area just below the clavicle (Area which coincides with the upper border of the sternum)\nMotor supply of upper-limb is C5_8 T,\nMotor supply of diaphragm (Phrenic nerve) is C3_5\nNow the findings of the patient in question:-\nLi Patient has quadriparesis (i.e. weakness of upper as well lower limbs) →p lesion should be above or at C5 dermatome (upper limb has motor supply C5_8 T1)\nSensory loss up to the upper border of sternum → C4 area\nRespiratory rate 35/minute → preservation of respiratory function with increased rate. Lesion at C4_5 level is consistent with preserved respiratory function and increased respiratory rate.\nSo, the lesion is at C4_5 level.', 'role': 'assistant'}]