Which one among the following cells produces antibodies against a foreign antigen?

Antibodies are produced by B-lymphocytes (a type of white blood cell) which differentiate into plasma cells upon encountering a foreign antigen. Erythrocytes (red blood cells) carry oxygen and lack a nucleus, so they do not synthesise antibodies. Eosinophils are involved in defence against parasites and in allergic reactions. Platelets are cell fragments involved in blood clotting. Therefore, lymphocytes are responsible for antibody production.