This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pharmacology
[{'content': "Pegvaliase was approved by FDA in 2018 for \nSelect and explain. \nA. Phenylketonuria, B. Pancreatic tumours, C. Crohn's disease, D. Glycogen storage disorders", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Pegvaliase is a drug approved for the treatment of phenylketonuria. Chemically, it is a pegylated derivative of the enzyme phenylalanine ammonia-lyase that metabolizes phenylalanine to reduce its blood levels.', 'role': 'assistant'}]