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
Chemotaxis is promoted by the all except - 
Select and explain. 
A. Lymphokine, B. Kallikerine, C. Serotonin, D. Complement factor
C: Serotonin
Answer: C: Serotonin 
Explanation: Ans. is 'c' i.e., Serotonin