Read the following passage carefully and answer the given questions.

The B-lymphocytes produce an army of proteins in response to pathogens. Each antibody molecule has four peptide chains, two small called light chains and two longer called heavy chains. Virus-infected cells secrete proteins called interferons which protect non-infected cells from further viral infection. Symptoms of allergic reactions include sneezing, watery eyes, running nose and difficulty in breathing. The use of drugs like anti-histamine, adrenalin and steroids quickly reduce the symptoms of allergy. Lymphoid organs are the organs where origin and/or maturation and proliferation of lymphocytes occur. The primary lymphoid organs are bone marrow and thymus. After maturation the lymphocytes migrate to secondary lymphoid organs like spleen, lymph nodes, tonsils, Peyer's patches of small intestine and appendix. Heroin commonly called smack is chemically diacetylmorphine which is a white, odourless, bitter crystalline compound. This is obtained by acetylation of morphine, which is extracted from the latex of poppy plant Papaver somniferum.

Interferons are produced by-

Virus infected cells

The correct answer is Option (1) → Virus infected cells

Interferons are proteins produced by cells in response to viral infections. When a cell is infected by a virus, it releases interferons, which act as signaling molecules to warn neighboring cells , acting as a crucial part of the innate immune response.These interferons help activate immune responses and make other cells more resistant to viral infection, thus providing protection against the spread of the virus. Virus-infected cells secrete proteins called interferons which protect non-infected cells from further viral infection.