This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Malnutrition, Subject name: Pediatrics
[{'content': 'Activity of glutathione reductase in RBCs gives an idea about functional index of which of the following? \nSelect and explain. \nA. Riboflavin, B. Pyridoxine, C. Niacin, D. Biotin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Activity of glutathione reductase in RBCs gives an idea about functional index of flavin coenzyme activity- Riboflavin', 'role': 'assistant'}]