This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology metabolism, Subject name: Physiology
Prostaglandin was discovered from - 
Select and explain. 
A. Tear, B. Saliva, C. Seminal fluid, D. Blood
C: Seminal fluid
Answer: C: Seminal fluid 
Explanation: Ans. is 'c' i.e.. Seminal fluid "The name prostaglandin comes from the prostate gland. When prostaglandin was first isolated from seminal fluid, it was believed to have been added from the prostate. "