This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: TB of the Spine, Subject name: Orthopaedics
The most common cause of paraplegia of early onset of Tuberculosis of spine is: 
Select and explain. 
A. Spinal artery thrombosis, B. Sudden collapse of vertebra, C. Sequestrum pressing on cord, D. Cold abscess pressing on the cord
D: Cold abscess pressing on the cord
Answer: D: Cold abscess pressing on the cord 
Explanation: (d)- Early onset paresis is due to inflammatory edema, granulation tissue, an abscess, caseous material. It has good prognosis. Late onset paresis is due to increasing deformity or reactivation of disease, or bony sequestrum, stenosis of the vertebral canal, fibrosis or vascular insufficiency and has poor prognosis.