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': 'Sulphur containing amino acid is/are \nSelect and explain. \nA. Aspartic acid, B. Glutamine, C. Methionine, D. Glycine', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Based on the chemical structure of side chain (R), amino acids are classified into:-\n\n1) Aliphatic amino acids:- Alanine, glycine, isoleucine, leucine, valine. \n2) Hydroxy amino acids:- Serine, threonine, tyrosine.\n3) Sulfur containing amino acids:- Cysteine, methionine.\n4) Dicarboxylic amino acids:- Aspartic acid (aspartate), glutamic acid (glutamate).\n5) Amide containing amino acids:- Glutamine, asparagine (these are amides of dicarboxylic amino acids.\nGlutamine is amide of glutamic acid and asparagine is amide of aspartic acid). \n6) Aromatic amino acids:- Phenylalanine, tyrosine, tryptophan.\n7) Amino acids or heterocyclic amino acids: - One of the 20 amino acids, proline is an amino (- NH) acid, not an amino (-NH2) acid, as are other 19.', 'role': 'assistant'}]