This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory chain, Subject name: Biochemistry
[{'content': 'Which of the following is an ionophore? \nSelect and explain. \nA. Carboxin, B. 2, 4 dinitrophonal, C. Atractiloside, D. Valinomycin', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Valinomycin: It produced by a type of Streptomyces. Transpos K+ from the cytosol into matrix and H+ from matrix to cytosol, thereby decreasing the proton gradient.so it is an ionophore.Ref: MN Chatterjea Textbook of Medical Biochemistry, 8th edition, page no: 146', 'role': 'assistant'}]