This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Inflammation & Repair, Subject name: Pathology
Chemotaxis in response to activation of cells results in- 
Select and explain. 
A. Random multidirectional movement, B. Unidirectional motion, C. Adhesion to endothelium, D. Augmeted oxygen dependent bactericidal effect
B: Unidirectional motion
Answer: B: Unidirectional motion 
Explanation: Ans. (b) Unidirectional motion(Ref: 9th/pg 77; 8th/pg 50)Unidirectional movement9 of the leukocytes towards site of injury along a chemical gradient.Exogenous QBacterial products: N-formylmethionine terminal amino acid Q and some lipidsEndogenous Products*. Complement system-C5a Q*. Arachidonic acid (AA) metabolites-LTB4 Q*. Cytokines- IL-8 Q