Which of the following diseases is characterised by a decline in platelet count?

Dengue is a viral infection transmitted by mosquitoes, and one of its characteristic features is a decline in platelet count. The virus affects the bone marrow, leading to a reduction in the production of platelets, which are essential for blood clotting.

Diabetes is a metabolic disorder related to insulin regulation and blood sugar levels. Anaemia characterised by a decline in RBC count or haemoglobin levels. Asthma causes inflammation and narrowing of the airways.