I believe the answer is the B-cell These are types of lymphocyte derived from the bone marrow and provides the humoral immunity. They produce antibodies; which are proteins that sticks to pathogen preventing them from sticking to cells and flagging them for destruction. The primary role of the B-cells is to make antibodies in large amounts and assist in destroying foreign agents through role as APC.
Colds are viruses that you can only get once and can be cured with antibiotics while its preffered to wait it out and take vitamins your answer is true
