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': 'An amino acid which does not participate in alpha helix formation? \nSelect and explain. \nA. Leucine, B. Methionine, C. Proline, D. Lysine', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Proline can only be stably accommodated within the first turn of an α helix. When present elsewhere, proline disrupts the conformation of the helix, producing a bend.\n\xa0\nHarper, Ed 30,\xa0Pg 38', 'role': 'assistant'}]