Paecilomyces lilacinus is a chemical used for the control of:

Correct option is E

Paecilomyces lilacinus is a naturally occurring fungus utilized as a biological control agent against nematodes. It works by infecting and killing nematodes that attack plant roots.
Examine each option:
(a) Fungus: Incorrect; Paecilomyces lilacinus is itself a fungus and is used to control nematodes, not fungi.
(b) Bacteria: Incorrect; it is not used to control bacteria.
(c) Virus: Incorrect; it does not target viruses.
(d) Protozoa: Incorrect; it does not control protozoa.
(e) Nematode: Correct answer; it is specifically used to control nematodes by acting as a biological control agent.