Final answer:
When you get a cold, your body makes more white blood cells. These cells are integral to the immune response, fighting off pathogens and providing protection against infections.
Step-by-step explanation:
When a student gets a cold, the body responds by making more white blood cells. White blood cells (also known as leucocytes) are a key component of the body's immune system, working to defend the body against bacteria, viruses, and other pathogens. During an infection, as the number of pathogens in the body increases, a response called positive feedback occurs, leading to an attraction of more white blood cells to the site of infection to fight off the invading organisms.
White blood cells can be classified into several types, each with specific functions, but generally, they all work to protect the body from infection. This category includes granulocytes and agranulocytes, which play roles in both immediate and longer-term immune responses.
Therefore, the correct answer to the question is b) White blood cells.