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: Physiology
Endogenous non-shivering thermogens are secreted by all except : 
Select and explain. 
A. Liver, B. Spleen, C. Hea, D. Small intestine
B: Spleen
Answer: B: Spleen 
Explanation: B i.e. Spleen