C

Judicious intravenous crystalloid fluid therapy is the mainstay for dengue patients who have warning signs but have not progressed to shock or significant bleeding; steroids and antivirals lack proven benefit, and prophylactic platelet transfusion is discouraged unless there is active haemorrhage. Supportive IV fluids correct plasma leakage and prevent progression to shock, as emphasized in WHO-based reviews [Tayal, 2023, 36574088; Rajapakse, 2011, 21633580].