Microscope , Telescope , Periscope , Stethoscope - Choose Odd Word - Classification - Verbal Reasoni

Choose or find odd word

Microscope , Telescope , Periscope , Stethoscope

Option:

A. Microscope

B. Telescope

C. Periscope

D. Stethoscope

Answer: D . Stethoscope

Justification:

All except Stethoscope are optical instruments.

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