The first line of treatment for attention deficit-hyperactivity disorder (ADHD) is:

Rationale:
A. St. John’s wort is not recommended during pregnancy due to limited safety data and potential drug interactions.
B. SNRIs may be considered in adults but have less safety data in pregnancy compared with SSRIs.
C. Selective serotonin reuptake inhibitors (SSRIs) are first-line pharmacologic therapy for depression during pregnancy when nonpharmacologic measures are insufficient. SSRIs like sertraline or fluoxetine have the most safety data for use in pregnant adolescents.
D. Tricyclic antidepressants (TCAs) are generally reserved for cases unresponsive to SSRIs due to more adverse effects and risk of cardiotoxicity.

Rationale:
A. Providing consultation at a local health fair is outside the scope of employment, so employer-provided coverage typically does not apply.
B. Treating a friend’s child is considered personal practice, not part of employment duties, and is not covered by employer insurance.
C. Performing the Heimlich maneuver in a public setting may be covered under Good Samaritan laws, but it is generally not covered by employer-provided malpractice insurance.
D. Treating students at the school-based health center is part of the nurse practitioner’s employment duties. Employer-provided malpractice insurance covers professional acts performed within the scope of employment, including assessment, diagnosis, and treatment of STDs in this setting.