Antivenom is used for the treatment of snake bite. The treatment of snake bite by antivenom is an example of

Just as Xenopsylla is to Yersinia pestis, so is:

Which one of the following statements is correct with respect to immunity?

A person likely to develop tetanus is immunized by administering

Match column I with column II and choose the correct answer from the options given below.

Assertion: The phenomenon where tumour cells detach and migrate to other parts of the body where they give rise to secondary tumours is called Metastasis.

Reason: Abnormal antigens on the surface of cell and unusual number of chromosomes cause Metastasis.

The correct answer is

Assertion: LSD and marijuana are clinically used as analgesics.

Reason: Both these drugs suppress brain function.

Assertion: Escherichia coli, Shigella sp. and Salmonella sp. are all responsible for diarrhoeal diseases.

Reason: Dehydration is common to all types of diarrhoeal diseases and adequate supply of fluids and electrolytes should be ensured.

Assertion: Mast cells in the human body release excessive amounts of inflammatory chemicals, which cause allergic reactions.

Reason: Allergens in the environment on reaching human body stimulate mast cells in certain individuals.

Which one of the following diseases is a communicable?