Answer: Hypersensitive response
Explanation:
The hypersensitive response is one of the type of mechanism that are used in the plants for preventing the plants from the infection that are caused by the microbial pathogens.
The hypersensitive response is the process that restrict the plants growth and also spread the pathogens to the different parts in the plants.
When the plants identify the pathogens then the plants activated the hypersensitive response.
Therefore, Hypersensitive response is the correct answer.