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: Pharmacology
[{'content': 'Immunosuppressive drugs are less effective in which type of graft rejection ? \nSelect and explain. \nA. Acute cellular rejection, B. Acute humoral rejection, C. Chronic rejection, D. None of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. is \'b\' i.e., Acute humoral rejectionBecause most clinically available immunosuppressive drugs target T-cells, they or inefective in antibody mediated rejection".', 'role': 'assistant'}]