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
The specialized mammalian tissue/organ in which fuel oxidation serves not to produce ATP but to generate heat is: 
Select and explain. 
A. Adrenal gland, B. Skeletal muscle, C. Brown adipose tissue, D. Heart
C: Brown adipose tissue
Answer: C: Brown adipose tissue 
Explanation: Ans. C. Brown adipose tissueBrown adipose tissue contains thermogenin, which is a physiological uncoupler of oxidative phosphorylation. This process is called Nonshivering Thermogenesis.