This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Primary Structure of Proteins, Subject name: Biochemistry
[{'content': 'Protein structure not lost in denaturation is? \nSelect and explain. \nA. Primary structure, B. Secondary structure, C. Tertiary structure, D. Quaternary structure', 'role': 'user'}, {'content': "Answer: A \nExplanation: ANSWER: (A) Primary structureREF: Lehninger 4th Edition page 14, Lippincott's 4th Ed page 22See previous questionRepeat Biochemistry December 2010", 'role': 'assistant'}]