Which of the following functions are macrophages unable to carry out?

Which of the following functions are macrophages unable to carry out?

1. T-cell priming.

2. Pinocytosis.

3. Phagocytosis.

4. Antigen presentation to activated cells.

Correct Option: Option A,

T-cell priming.

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 Macrophages have an impressive range of functions but appear unable to prime naive lymphocytes. This can be carried out by lymphoid interdigitating dendritic cells and cultured, but not freshly isolated, Langerhans' cells.