In $\mathrm{Fe}(\mathrm{CO})_5$, the $\mathrm{Fe}-\mathrm{C}$ bond possesses

• A

  $\pi$-character only
• Correct answer
  B

  both $\sigma$ and $\pi$ characters
• C

  ionic character
• D

  $\sigma$-character only

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