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British scientists claimed that they developed in the first week ...

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Question:
British scientists claimed that they developed in the first week of December 2012, the first toothbrush of the world called Emmident toothbrush which makes use of the ________ for cleaning teeth. Fill in the blank with appropriate word.

Option A):
None of these
Option B):
X-Ray
Option C):
Ultrasound waves
Option D):
3D Imaging

Correct Answer is Option C):
Ultrasound waves

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