Microbiology To fully activate a naive CD4 T cell, the antigen-presenting cell has to express? A MHC class I and class II molecules B Interleukin-2 C B7 and MHC class II molecules D CD28 and MHC class II molecules 💡 Explanation To fully activate a naive CD4 T cell, the antigen-presenting cell has to express? ✓ Correct Answer: C. B7 and MHC class II molecules