This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of nucleic acids, Subject name: Biochemistry
[{'content': 'Operon model was elucidated by \nSelect and explain. \nA. Jacob & Monad, B. Waston & Crick, C. Leiderburg & Tautum, D. Two D Herell', 'role': 'user'}, {'content': 'Answer: A \nExplanation: FRANCOIS JACOB and JACQUES MONAD put forward the operon concept in 1965Theory was based on the observation on lactose metabolism in Escherichia coliRef: DM Vasudevan, 7th edition, page no: 617', 'role': 'assistant'}]