__ in __ adults experience mental illness.

__ in __ adults experience mental illness.

• A. 1 in 3
• B. 1 in 10
• C. 1 in 50
• D. 1 in 5

Answer: (D)

About one in five adults experience some form of mental illness in a given year. This annual prevalence figure, roughly 20%, is the standard way health researchers express how widespread mental health conditions are in the adult population over a 12-month period. It captures a broad range of conditions—from common issues like anxiety and depression to more severe disorders—so it aligns with the statement asking how many adults are affected in a year. While lifetime prevalence is higher (many people will experience a mental health condition at some point in their lives), the question focuses on a single year, which is why the one-in-five figure is the best match. The other options would understate or overstretch the typical annual reach of mental illness.

About one in five adults experience some form of mental illness in a given year. This annual prevalence figure, roughly 20%, is the standard way health researchers express how widespread mental health conditions are in the adult population over a 12-month period. It captures a broad range of conditions—from common issues like anxiety and depression to more severe disorders—so it aligns with the statement asking how many adults are affected in a year. While lifetime prevalence is higher (many people will experience a mental health condition at some point in their lives), the question focuses on a single year, which is why the one-in-five figure is the best match. The other options would understate or overstretch the typical annual reach of mental illness.