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: Unknown
[{'content': 'Amino-acid substitute for tryptophan without altering proteins characteristics - \nSelect and explain. \nA. Tyrosine, B. Phenylalanine, C. Methionine, D. Alanine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. is \'b\' i.e., Phenylalanine o Tryptophan is an aromatic amino acid, thus it can only be replaced with other aromatic amino acid, o Other two aromatic amino acids area)Phenylalanineb)Tyrosineo Among these two, phenylalanine can substitute tryptophan but not tyrosine because#Phenylalanine and tryptophan both are hydrophobic (non-polar).#Whereas, tyrosine is hydrophilic (Polar)."The only other aromatic residue that can substitute for tryptophan is phenylalanine. Tyrosine cannot substitute since it has hydrophilic property "', 'role': 'assistant'}]