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
Patient presenting with pellagra, parkinsonism, convulsions, anemia and kidney stones has deficiency of 
Select and explain. 
A. Coenzyme A, B. FADH, C. Niacin, D. Pyridoxal phosphate
D: Pyridoxal phosphate
Answer: D: Pyridoxal phosphate 
Explanation: D i.e. Pyridoxal phosphate