In a scientific experiment, a dependent variable can be described as the variable which is being tested or observed. An independent variable can a be described as the variable which is experimented and whose changes will change the dependent variable. In the experiment mentioned in the question as the drug is being tested hence, it is the dependent variable. Levels of cholesterol are the independent variable.
If a patient has been drinking fluids, the patient should wait 10 - 15 minutes before taking an oral temperature. There shouldnt be any type of liquid, hot or cold in your mouth for atleast 10 minutes before taking the test. The answer to your question is letter A.
