A clinical thermometer is

always mercury based

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always digital

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either mercury-based or digital

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Neither mercury based nor digital

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Solution

The correct option is C
either mercury-based or digital

A clinical thermometer can either be mercury-based or digital. A clinical thermometer is a thin glass tube filled with a small amount of mercury. When mercury gets hotter, it expands (increases in size) by an amount that corresponds to the temperature. A digital thermometer gives the direct reading.

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