A family member tells the nurse, "I am concerned about my brother. He has been acting very different lately." Knowing the family has a history of bipolar disorder, the nurse inquires further about this. Which behavior during the past week might indicate that the brother has bipolar disorder?

Choice A reason: Intense focus can occur in certain mental health conditions, but in bipolar disorder, especially during manic episodes, the hallmark is distractibility and impulsivity rather than sustained focus. Choice B reason: Low self-esteem is more characteristic of depressive disorders. While bipolar disorder includes depressive phases, the question emphasizes recent behavioral changes, and risk-taking is more indicative of mania. Choice C reason: Taking unnecessary risks is a classic sign of mania in bipolar disorder. Manic episodes often involve impulsive behaviors such as reckless spending, unsafe sexual activity, or dangerous driving. This aligns directly with the diagnosis. Choice D reason: Sleeping more is associated with depression, not mania. In mania, individuals typically sleep less but still feel energized.