For a screw gauge least count of the main scale is $1 \mathrm{m}\mathrm{m}.$ Find the minimum number of divisions on the circular scale so that it can measure a diameter of $5\mathrm{\mu m}$

• A

  $500$
• B

  $100$
• C

  $50$
• Correct answer
  D

  $200$

Hence, the correct answer is option: 'D'.