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: Medicine
Which is not affected in lesion of posterior column of spinal cord ? 
Select and explain. 
A. Romberg's sign, B. Temperature sense, C. Vibration sense, D. Ataxia
B: Temperature sense
Answer: B: Temperature sense 
Explanation: None