Choose the word which is different from the rest.

The answer is: B. Microphone

A microscope is an instrument used to magnify small objects. A microphone is a device used to convert sound waves into electrical signals. Microfilm is a photographic film used to record images or documents at a very small size. A microbe is a tiny organism that can only be seen with a microscope.

Microphones, microfilm, and microbes are all related to the concept of smallness. However, a microphone is not an instrument used to magnify small objects. It is a device used to convert sound waves into electrical signals.