Which one of the following pair is correctly matched?

Correct option is A

· Correct answer: (a) Azodrin-monocrotophos
· Azodrin is an insecticide based on monocrotophos, which is an organophosphate compound used to control pests in various crops.
Other options:
· (b) Baygon-fenthion: Baygon and fenthion are not related in the way described in the question.
· (c) Dursban-phosphamidon: Dursban is a different pesticide not directly related to phosphamidon.
· (d) DDVP-Malathion: While both are insecticides, they are not typically combined under a single trade name.