In which population is bipolar disorder equally occurring?

Bipolar disorder is known to occur with similar prevalence in both males and females, making the choice of both genders the correct answer. Research shows that while the presentation and course of the disorder may differ by gender, the overall incidence rates are relatively equal.

In males, the onset of bipolar disorder often occurs earlier, typically in late adolescence or early adulthood, and they might experience more severe manic episodes. In contrast, females tend to show a later onset and often have more depressive episodes. Hormonal fluctuations, particularly related to menstrual cycles, may influence the course of the disorder in females. However, these differences in presentation do not lead to a difference in prevalence rates; both genders are affected at similar rates in the general population.

The other options reflect populations that do not have equal occurrences of bipolar disorder. Males only or females only would incorrectly suggest a gender disparity in prevalence, while children alone would overlook the adult populations that also experience the disorder.