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: Biochemistry
Which of the following is present in the plasma but absent in the serum? 
Select and explain. 
A. Albumin, B. Globulin, C. Lecithin, D. Fibrinogen
D: Fibrinogen
Answer: D: Fibrinogen 
Explanation: None