I believe the answer is: double-blind experiment
In double blind experiments, the subjects that receive the treatment is remained unknown by both the researchers and the subjects until the experiment is finished. The main purpose of double-blind experiment it eliminate the bias of perception that might exist among researchers.
Here is the correct answer that would complete the given statement above. <span>All of the department heads are called secretaries except the attorney general. The attorney general belongs to the Department of Justice. Hope this is the answer that you are looking for. </span>
<em>Answer:</em>
<em>discriminates between the Scooby-Doo cup and the Dora cup </em><em> </em>
<em>Explanation:</em>
<em><u>Discrimination</u></em><em> is determined as the capability or proclivity of a person to respond and perceive the differences present among distinct stimuli. Therefore, according to psychologists, discrimination is considered as a more advanced type of learning as compared to generalization, however, animals and human beings can be trained for both generalization as well as discrimination.</em>
<em><u>In the given context of the question, Lacy refuses to drink because she is able to discriminate between both the cups. </u></em>