Correct Answer: Sea anemone

Solution : The correct option is Sea anemone.

Nematocysts are specialised stinging cells found in a wide range of aquatic species, including sea anemones. Sea anemones employ these cells for defence and prey capture. When activated, nematocysts can expel a harpoon-like structure containing poisons, immobilising or killing tiny prey that comes into contact with the sea anemone's tentacles.