Which of the following oil cakes, in addition to its manurial value, also acts as a nitrification inhibitor

Answer: Option C

Among the given options, Neem oil cakes, in addition to their manurial value, also acts as a nitrification inhibitor.
Neem oil cake organic manure protects plant roots from nematodes, soil grubs and termites, probably due to its residual limonoid content. It also acts as a natural fertilizer with pesticide properties.
It also acts as a nitrification inhibitor as it blocks soil bacteria from converting nitrogenous compounds into nitrogen gas and prolongs the availability of nitrogen to both short-duration and long-duration crops.