This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bleeding Disorders, Subject name: Pathology
Which of the following is not a component of the dense granules of platelets? 
Select and explain. 
A. ADP, B. Calcium, C. Epinephrine, D. Platelet factor 4
D: Platelet factor 4
Answer: D: Platelet factor 4 
Explanation: Ans. (d) Platelet factor 4(Ref: Robbins 9th/pg 660)Dense (or d) granules of platelets contain: ("DENSE")aDENosine diphosphate (ADP) Q, Serotonin Q, Epinephrine Q, Ca