Correct Answer: Only III

Solution : The incorrect pair is Tamarind - Citric acid .

Vinegar is produced when acetic acid Bacteria digest ethanol. The primary acid in vinegar is acetic acid.

Making curd involves fermenting milk with bacteria, usually Lactobacillus, which changes lactose into lactic acid as a byproduct of fermentation. Lactic acid gives curd its sour flavour and helps to improve its texture.

Tartaric acid, not citric acid, is the primary acid found in tamarind. Tartaric acid, which gives tamarind its distinctive sour flavour, is used in culinary and beverage applications.