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': 'What will happens to structure of alpha-helix if L-alanine is replaced by d-alanine alternatively \nSelect and explain. \nA. Change in optical activity, B. Interruption of structure, C. Increased stereoisomerism, D. Increased stability', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Interruption of structureD-amino acid would interrupts an a-helix made of L-amino acid.D-amino acid substitution in a-helix causes a local change in structure and flexibility at the substituted site, which leads to destabilization", 'role': 'assistant'}]