Eric McMaster, age 24, is known to be dependent on a variety of chemical substances, including alcohol and cocaine. Which of the following statements is an example of the most common defense mechanism employed by those dependent on chemical substances?

Choice A reason: This statement is an example of rationalization or "normalization," where the individual tries to justify their behavior by suggesting that it is common or socially acceptable. While common in substance abuse, it is not the "most" primary defense mechanism used to protect the ego from the reality of addiction. Choice B reason: This statement reflects a degree of insight into the functional use of substances for self-medication. Defense mechanisms are typically unconscious processes that distort reality; explicitly stating a "need" for the drug is an admission of dependency rather than a protective psychological defense. Choice C reason: Denial is the most common and signature defense mechanism in substance use disorders. It involves a total refusal to acknowledge the existence of the problem despite clear evidence to the contrary. By claiming they "rarely" or "never" use, the patient protects themselves from the anxiety of facing their addiction. Choice D reason: This is an example of intellectualization or minimization, where the patient tries to make their substance use seem less severe by comparing it to more "dangerous" drugs. While it helps avoid the gravity of the situation, it is a secondary defense compared to the foundational role of denial.