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Which of the following is not an application of a transistor?

A Transformer
A transistor is a semi-conductor device designed to amplify and switch electronic signals and electric power. A transistor has a wide range of applications including electric switch, amplifier, voltage and current regulator etc. A transistor is different from a transformer, a transistor is a semi-conductor device while a transformer is an electromagnetic device.
B Electric Switch
C Amplifier
D Current Regulator