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: Surgery
In a case of tuberculosis of the thoracic spine, the earliest sign of cord compression is: 
Select and explain. 
A. Bladder dysfunction, B. Extensor plantar, C. Motor weakness, D. Sensory loss
B: Extensor plantar
Answer: B: Extensor plantar 
Explanation: Ans. b. Extensor plantar