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: Microbiology
Leukotrienes are secreted by all except 
Select and explain. 
A. Macrophages, B. T4 cells, C. T8 cells, D. Platelets
D: Platelets
Answer: D: Platelets 
Explanation: Ans. is 'd' i.e., Platelets