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
[{'content': 'In a case of sporadic ataxia, what lab investigation is not done: \nSelect and explain. \nA. Serum folate, B. Vit E, C. Vit Bl, D. TSH', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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.', 'role': 'assistant'}]