The antibodies are

Identify the correct statement.

Person '$A$' cannot step out of his house. He has to spend his entire life in sterile isolation; otherwise, he would quickly contract a fatal infection. This person has almost no effective immune system. This disease is also called '$baby$ $in$ $a$ $bubble$ $syndrome$'. Identify the disease this person '$A$' is suffering from.

Identify the cell that induces the process of $cytolysis$.

Immunoglobulins are made up of

Lymph nodes form: