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: Pathology
In a case of sporadic ataxia, what lab investigation is not done: 
Select and explain. 
A. Serum folate, B. Vit E, C. Vit Bl, D. TSH
A: Serum folate
Answer: A: Serum folate 
Explanation: Serum vitamin B12 levels assessment is important for assessment of a case of sporadic ataxia. However, serum folate is not important for ataxia assessment as it is not related.