An example of a current manufacturer's brand name that has not become generic is an escalator. Thus the correct option is A.
What is Generic?
Generic refers to or is shared by a large collection of similar items; it is not specialized to one thing. Generic drugs function similarly to their name-brand competitors.
Examples of brand names that have evolved into general terms for a certain category of goods are Taser, and Xerox. Some less well-known instances of brand names that have evolved into common nouns include escalator and kerosene.
Therefore, option A is appropriate.
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