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
Which of the following acts as physiological uncoupler? 
Select and explain. 
A. Insulin, B. Epinephrine, C. Growth harmone, D. Thyroxine
D: Thyroxine
Answer: D: Thyroxine 
Explanation: Examples of physiological uncouplers are:

Thyroxine
Thermogenin (presnt in brown adipose tissue)
Long chain free fatty acid
Unconjugated Bilirubin