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: Biochemistry
Which is not pyridoxine dependant: 
Select and explain. 
A. Homocystinuria, B. Maple syrup urine disease, C. Oxaluria, D. Xanthinuria
B: Maple syrup urine disease
Answer: B: Maple syrup urine disease 
Explanation: B i.e. Maple syrup urine disease