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: Pathology
Prostaglandins are synthesized from: 
Select and explain. 
A. RNA template, B. Rough endoplasmic reticulum, C. Polyunsaturated fatty acids, D. None of the above
C: Polyunsaturated fatty acids
Answer: C: Polyunsaturated fatty acids 
Explanation: None