Microbiology IL-1 is produced by -a) Macrophageb) Helper T lymphocytesc) B cellsd) Cytotoxic T-cells A a B bc C ac D b 💡 Explanation IL-1 is produced by -a) Macrophageb) Helper T lymphocytesc) B cellsd) Cytotoxic T-cells ✓ Correct Answer: C. ac