Interferons are protein molecules produced from

The correct option is B Infected host cells

• When the viral infection infected host cells in our body. The infected host cells produce Interferons (are a group of proteins called cytokines). Interferons suppress the viral multiplication.
  
• The name of the interferons comes from their ability to interfere with the production of new virus particles. Interferons do not directly kill viral or cancerous cells; they boost the immune system response and reduce the growth of cancer cells by regulating the activity of several genes that control the secretion of numerous cellular proteins that affect growth.
  
• Hence Interferons are protein molecules produced from Infected host cell.
  
• So, the correct answer is 'Infected host cell'