This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Spinal Injuries, 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 sternum and respiratory rate of 35/minute. The likely level of lesion is: \nSelect and explain. \nA. C1 - C2, B. C4 - C5, C. T1 - T2, D. T3 - T4', 'role': 'user'}, {'content': 'Answer: B \nExplanation: (b) C4-C5- C2 dermatome - Occiput and top part of neck.- C3 dermatome - Lower part of neck up to the clavicle.- C4 dermatone - Area just below the clavicle (Area which coincide with upper border of sternum).- Motor supply of upper-limb is C5-8 T1 - Motor supply of diaphragm (Phrenic nerve) is C3-5 - Thus C4 -C5 prolapse will cause increased respiratory rate with all mentioned features.', 'role': 'assistant'}]