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Which substance is used to maintain electrical insulation between a heat sink and transistor?

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Which substance is used to maintain electrical insulation between a heat sink and transistor?

(a) plastic

(b) fiber

(c) ceramic

(d) mica

I got this question during an interview for a job.

The question is from Heat Sink for Power Transistor-2 in section Power Amplifier of Analog Circuits

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Best answer
Right option is (d) mica

For explanation I would say: Many transistors have metal cases which are connected to a lead and thus it becomes necessary to insulate the heat sink from the transistor. Insulating kits of a mica sheet and a plastic sleeve are used.

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