Answer: d. double-blind
Explanation:
A double blind study can be define as the study in which both the researcher and participant do not know which participant is receiving a particular treatment. This method is useful as it prevents the bias in the results of the experiment.
The given situation is the example of double-blind study. Here, the participants as well as the researcher do not know which group of subject are receiving bacteria in the yogurt and which group is not receiving.
Insurance and surgical costs
The drug connects receptors that are only connected during sex, eating your favorite food, excising, etc. Therefore releasing <span>Endorphins. This makes you feel really good. Soon your brain will run out of </span><span>Endorphins since the drug makes it release them all at once making you need the drug to function (addiction).</span>
