A sexually transmitted disease, symptomized by the development of ulcers on the genitals, is caused by the infection of

Hypersensitivity to an allergen is due to

During an allergic reaction, the binding of antigens to IgE antibodies initiates a response, in which chemicals cause the dilation of blood vessels and a host of other physiological changes. Such chemicals are

In the sigmoid curve of growth, the alphabets indicate the sequence of events. Choose the correct option where the alphabet specifies the event.

Swollen face, mental dullness, dry skin and loss of appetite is the characteristics of

Assertion: There is no chance of malaria to a man on the bite of male Anopheles mosquito.

Reason: It carries a non-virulant strain of Plasmodium.