Consider the following statements:

1. Dengue is a protozoan disease transmitted by mosquitoes.
2. Retro-orbital pain is not a symptom of Dengue.
3. Drastic Decline in number of blood platelets is found in patients suffering from dengue.

Select the correct statement using the codes given below:
a) 1 and 2 only
b) 3 only
c) 2 and 3 only
d) 1 and 3 only

Ans- b

Explanation-Dengue is caused by dengue virus. It is malaria which is caused by protozoa. Thus, statement 1 is wrong.

Retro orbital pain or pain behind the eyes is one of the symptom of Dengue. See here. Statement 2 is wrong.

Dengue is disease in which platlets get greatly reduced. Thus statement 3 is correct.