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
[{'content': 'Aminoacid that enters the TCA cycle for gluconeogenesis & Ketogenic in nature \nSelect and explain. \nA. Pheylalanine, B. Alanine, C. Glycine, D. Serine', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Phenylalanine is both glucogenic (gluconeogenic) and ketogenic.', 'role': 'assistant'}]