$\mathrm{Mr} . \mathrm{X}$ is eating curd/yoghurt. For this food intake in a food chain he should be considered as occupying

Mr. X eating curd / yoghurt should be considered as occupying third trophic level. Producers or greeen plants (first trophic level) are consumed by herbivore (second trophic level). And from them curd, yoghurt (made from dairy breed) is consumed by third trophic level like man.