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
[{'content': 'Chemotaxis in response to activation of cells results in- \nSelect and explain. \nA. Random multidirectional movement, B. Unidirectional motion, C. Adhesion to endothelium, D. Augmeted oxygen dependent bactericidal effect', 'role': 'user'}, {'content': 'Answer: B \nExplanation: 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', 'role': 'assistant'}]