Explanation

Sodium benzoate (often misspelled as Nisim/Nisim in local contexts or referring to specific brand names like 'Nisim' which might be a typo for Sodium Benzoate or similar preservatives commonly used in dairy) is a common preservative. However, Parabens are also used. Let's verify. Actually, Sodium Benzoate is the standard answer for acidic foods. In dairy, Calcium Propionate or Natamycin are common. But looking at typical MCQs from this region (Pakistan), 'Nisim' is likely a typo for 'Sodium Benzoate' or refers to a specific local term. Wait, 'Nisim' might be a typo for 'Nisin'? Nisin is a natural preservative used in dairy products like cheese and condensed milk. Yes, Nisin is correct for dairy. Parabens are less common in dairy due to pH issues. Epexider is not a standard preservative name. So C is likely correct referring to Nisin.