We consider the radiation emitted by the human body, which of the following statements is true?

• A

  The radiation is emitted only during the day.
• B

  The radiation is emitted during the summers and absorbed during the winters.
• C

  The radiation emitted lies in the ultraviulet region and hence is not visible.
• Correct answer
  D

  The radiation emitted is in the infrared region.

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