Which of the following is a correct pair of singular and plural?

Stomach:Stomachs

The correct answer is Option (2) → Stomach:Stomachs

Among the given options, the correct pair of singular and plural is:

Stomach: Stomachs

Here's an explanation of all the options:

1. Storey: Stories - This is incorrect. The singular form is "storey," referring to a level or floor in a building, and the plural is "storeys," not "stories."
2. Stomach: Stomachs - This is correct. The singular form is "stomach," referring to the organ in the body, and the plural is "stomachs."
3. Tooth: Tooths - This is incorrect. The singular form is "tooth," and the plural is "teeth," not "tooths."
4. Hair: Hairs - In most cases, "hair" remains the same in both singular and plural forms when referring to the collective mass of hair.

So, "Stomach: Stomachs" is the correct pair.