Which of the following types of brain activity are present during stage 2 sleep?

Jasmine deeply believes that her professor is in love with her, despite the fact that she is in his online course, and he has no idea who she is. This is an example of ______

a. A hallucination b. A delusion c. An extrapyramidal symptom d. Paranoia

Which type of study begins with a group of people who are already suffering from a disease and then examines factors associated with that disease?

A) experimental B) placebo C) prospective D) retrospective