The question asks about 'Insaans' (humans/normal people) of the class. According to the class joke/labeling system, 'deepa-rajni' (option C) is designated as the 'insaans' - implying they're the most normal or human-like compared to others who have snake/animal nicknames. Other pairs (omkar-sunil, pradnya-omkar, shahnawaz-pranit, prernna-rahul, richa-kavita) don't have this specific designation.