Answer to this question is b
The cells of the immune system can be categorized as lymphocytes (T-cells, B-cells and NK cells), neutrophils, and monocytes/macrophages. These are all types of white blood cells. The major proteins of the immune system are predominantly signaling proteins (often called cytokines), antibodies, and complement proteins
I'm thinking the answer is Carbohydrate. So the answer would be option A.
Is this a question if it is please make it clear because it seems to me that your not asking anything
Answer:
The fact that both strands are used as templates for DNA replication the response would be the first one.