Choose the noun which is only used in the singular form: Выберите один ответ: • a. colour • b. cable • c. coffee • d. cigarette • e. chair

The noun that is only used in the singular form from the given options is:

• c. coffee

While "coffee" can be pluralized in informal contexts when referring to types or kinds (like "coffees" at a coffee shop), it is typically treated as a non-count noun in standard usage, meaning it does not have a plural form when referring to the substance itself. All the other options can be used in both singular and plural forms.