To describe the role of biology in mental illness, which statement is accurate?

• A. There are multiple physical causes that can involve brain structures.
• B. Biological factors alone determine mental illness.
• C. Psychological factors are the only contributors.
• D. Biological causes are solely environmental.

Answer: (A)

Biology in mental illness operates through multiple physical pathways that involve brain structures and chemistry. Research shows mental disorders often relate to differences in brain regions and circuits (for example, areas in the frontal cortex and limbic system) and to imbalances in neurotransmitters like serotonin and dopamine. Genetic factors create vulnerability, and development, hormones, inflammation, and life experiences interact with biology to influence risk. This multifactorial view—several physical causes that involve brain structures—best fits how biology contributes to mental illness. Other statements are too narrow or misrepresent how biology relates to environment and psychology.