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Researchers at a local medical college are interested in the effectiveness of a new drug aimed at reducing the infectivity of CMV and thus decreasing the rate of graft failure in patients that receive a kidney transplant. Patients are enrolled on a competitive basis, and the project is funded by an external sponsor organization. Patients are randomly assigned to receive either the new CMV drug, or the current best care treatment. These patients are monitored with regular physician visits for 1 year following transplant. A) What type of study is this? B) What are the explanatory and response variables? PLEASE CHOOSE THE MOST APPROPRIATE OPTION A) Experimental, placebo controlled B) Explanatory: new drug reducing CMV; response variable: graft failure 2 A) Observational, placebo controlled B) Explanatory: graft failure; response variable: new drug reducing CMV 3 A) Survey B) Explanatory: new drug reducing CMV; response variable: current best care treatment