The correct option is
B Chemical messengers from lymphocytes
- Lymphokines are a typer of cytokines which are secreted by the lymphocytes (immune cell).
- Cytokines are a type of small proteins secreted by cells of the immune system that helps in signalling and effects the behaviour of the neighbouring cells.
- Lymphokines attract the other cells of the immune system such as macrophages and other lymphocytes to an infected site and activate them to prepare for an immune response.
- They are secreted by the T-lymphocytes.
- Lymphokines help the B- lymphocyte cells to produce antibodies.
- So, the correct answer is 'Chemical messengers from lymphocytes'.