A 5-year-old boy presents with fever, conjunctival redness, strawberry tongue, and cervical lymphadenopathy. Kawasaki disease primarily affects which vessels?

Correct option is B

Kawasaki disease is a medium-vessel vasculitis, classically affecting coronary arteries, leading to risk of aneurysms and sudden cardiac death.
Explanation of options: (a) Large-vessel vasculitis includes Takayasu and giant cell arteritis. (b) Correct; Kawasaki targets medium-sized arteries, especially coronaries. (c) Small-vessel vasculitis includes Henoch–Schönlein purpura. (d) Pulmonary arteries are rarely involved in Kawasaki.