Which of the following is the correct description of interferon?

• A

  A synthetic neurotransmitter used to treat neuronal diseases
• B

  A class of proteins secreted by B-lymphocytes that categorically attack and destroy virus infected cells
• Correct answer
  C

  A class of proteins secreted by virus infected cells and are involved in protecting uninfected cells
• D

  Signalling molecules that interfere with its own synthesis inside a secretory cell

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