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
Leptin is secreted by? 
Select and explain. 
A. Ovaries, B. Adipose tissue, C. Liver, D. Hypothalamus
B: Adipose tissue
Answer: B: Adipose tissue 
Explanation: Ans, B, Adipose tissue.(Ref: Principles of medical physiology p.p'704)Leptin is a protein hormone produced by fat cells of adipose tissue.It acts on hypothalamus to reduce food intake, decrease lipogenesis and increase lipolysis, thereby reducing the body fat stores.