<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:You have been asked to quantify the relative risk of developing bacterial meningitis following exposure to a patient with active disease. You analyze 200 patients in total, half of which are controls. In the trial arm, 30 of exposed patients ultimately contracted bacterial meningitis. In the unexposed group, only 1 contracted the disease. Which of the following is the relative risk due to disease exposure?? A: 30 30 70 1 1 99, B: 30 99 70 1, C: 70 30 70 99 1 99, D: 70 1 39 99, E: 1 1 99 30 30 70,  <response>: This is a relative risk calculation question. To calculate relative risk, we need to know the incidence of disease in the exposed group versus the unexposed group. The exposed group had 30 contract meningitis, which is 30100.The unexposed group had 1 contract meningitis, which is 1100. To calculate relative risk, we take the incidence in the exposed group divided by the incidence in the unexposed group.A: 30 30 70 1 1 99 