Which one of the following is used in preparing a natural mosquito

Which one of the following is used in preparing a natural mosquito repellent?

Congress grass
Elephant grass
Lemongrass
Nut grass
This question was previously asked in
UPSC IAS – 2021
Lemongrass (Cymbopogon species) is widely known for its natural mosquito repellent properties. It contains citronella oil, a volatile oil commonly used as an ingredient in mosquito repellents, candles, and lotions. The strong citrusy scent of lemongrass is effective in deterring mosquitoes and other insects.
– Congress grass (Parthenium hysterophorus) is an invasive weed notorious for causing allergies and has no repellent properties; in fact, it can be harmful.
– Elephant grass (Pennisetum purpureum) is a tall, fast-growing grass primarily used as fodder or for biomass energy; it is not used as a mosquito repellent.
– Nut grass (Cyperus rotundus) is a common weed with some traditional medicinal uses, but it is not widely known or used as a mosquito repellent.
Lemongrass contains citronella oil, a well-established natural insect repellent.
Other plants known for mosquito repellent properties include Citronella (closely related to lemongrass), Lemon Eucalyptus, Catnip, Basil, Lavender, and Peppermint.