In an Experiment, One Group of Participants Is Exposed to Treatment

question 4

Multiple Choice

In an experiment, one group of participants is exposed to treatment, another is exposed to an application identified to them as treatment, and another is not exposed to any treatment. In such a procedure, the participants who are not exposed to any form of treatment, either genuine or false, are classified as the ________ group.

• A) rival
• B) placebo
• C) experimental
• D) control

---

Definitions:

Sphincter

A ring-like muscle that controls the passage of substances through an opening in the body, such as the anus or esophagus.

Smooth Muscle

A type of muscle tissue which is not under conscious control, found in the walls of internal organs such as the stomach and intestines.

Humerus

The long bone in the upper arm or forelimb, extending from the shoulder to the elbow.

Cartilaginous Skeleton

A type of anatomical structure where the skeleton is made entirely of cartilage, as seen in sharks and rays.