Concept:
Macrophages occur in different tissues of the body and receive different names according to their location. They belong to the mononuclear phagocyte system.
Step 1: Understand what macrophages are.
Macrophages are large phagocytic cells. Their functions include:
• Engulfing microbes
• Removing dead cells
• Antigen presentation
• Immune defense
Step 2: Recall special names of macrophages. \[ \begin{array}{|c|c|} \hline \text{Location} & \text{Name} \\ \hline \text{Connective tissue} & \text{Histiocytes} \\ \hline \text{Liver} & \text{Kupffer cells} \\ \hline \text{Brain} & \text{Microglial cells} \\ \hline \text{Blood} & \text{Monocytes} \\ \hline \end{array} \]
Step 3: Apply the information.
The question asks specifically about connective tissue macrophages.
These are called: \[ \boxed{\text{Histiocytes}} \]
Step 4: Choose the answer.
\[ \boxed{\text{Option (A)}} \]


