If $5 \mathrm{mg}$ of ${}^{235}U$ is completely destroyed in an atom bomb, then approximate total energy released is (given that the energy released per fission is $200 \mathrm{MeV}$)

• Correct answer
  A

  $4\times {10}^8 \mathrm{J}$
• B

  $6\times {10}^9 \mathrm{J}$
• C

  $5\times {10}^7 \mathrm{J}$
• D

  $3\times {10}^{10} \mathrm{J}$

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