Which cells are the classic antigen-presenting cells for initiating T-cell responses?

Which of the following pathologic findings is most characteristic of Parkinson disease?

A comatose patient exhibits extension of the upper and lower extremities with internal rotation and plantar flexion in response to noxious stimuli. This posturing suggests a lesion:

Electric-shock facial pains seconds in duration in the V2/V3 distribution, triggered by light touch; exam otherwise normal. Most common underlying mechanism:

A 29-year-old nonsmoker presents with basilar panacinar emphysema on outpatient CT and mild transaminitis. What is the best next step in primary care?

You counsel a patient with symptomatic SIADH (Na⁺ 110 mEq/L). Which safety warning is correct regarding correction?

Which statement best describes the normal role of IgD?

Untreated obsessive-compulsive disorder increases risk for:

A 58-year-old reports progressive penile curvature with painful erections after minor trauma months ago. Most consistent pathophysiology?

Why are cardiac troponins the preferred biomarkers in suspected MI?