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 physiological uncoupler? \nSelect and explain. \nA. Thermogenin, B. 2, 4 nitrophenol, C. 2, 4 Dinitrophanal, D. Oligomycin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Physiological uncouplers i. Thyroxine, in high doses ii. Thermogenin in brown adipose tissueRef: DM Vasudevan Textbook of Medical Biochemistry, 6th edition, page no: 234', 'role': 'assistant'}]