This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Epidemiology, Subject name: Social & Preventive Medicine
[{'content': 'While testing the deleterious health hazards on a group of people after giving a drug and a placebo, the following results were obtained: Number of people Number of people affected Placebo 15225 1605 Drug 15225 1804 Which of the following is true? \nSelect and explain. \nA. Relative risk reduction is (RRR) 11% Absolute risk reduction(ARR) is 11%, B. RRR 11%, ARR 1%, C. RRR 1%, ARR 11%, D. RRR 1%, ARR 1%', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Absolute Risk Reduction(ARR) = Reduction in outcome between new drug and placebo in absolute terms Relative risk reduction(RRR)= Relative or percentage reduction in outcome between new drug and placebo. Event rate for drug(Ed)= 1804/15225 x 100= 0.118 Event rate for placebo(Ep)= 1605/15225 x 100= 0.105 ARR= Ed-Ep= 0.013=1.3% RRR= Ed-Ep/Ed= 0.013/0.118= 0.11=11%', 'role': 'assistant'}]