To solve this problem, we need to identify which cells in the Crypts of Lieberkühn secrete antibacterial lysozyme. Let's analyze each option:$\newline \bullet$Option 1: Paneth cells$\newline$ - Paneth cells are specialized cells located at the base of the Crypts of Lieberkühn in the small intestine.$\newline$ - They are known for secreting lysozyme, an enzyme with antibacterial properties that helps maintain gut flora balance.$\newline$ - Therefore, Paneth cells are responsible for secreting antibacterial lysozyme.$\newline \bullet$Option 2: Zymogen cells$\newline$ - Zymogen cells, also known as chief cells, are found in the stomach and are responsible for secreting pepsinogen, not lysozyme.$\newline$ - Thus, they are not the correct answer.$\newline \bullet$Option 3: Kupffer cells$\newline$ - Kupffer cells are specialized macrophages located in the liver and are involved in the breakdown of red blood cells.$\newline$ - They do not secrete lysozyme.$\newline \bullet$Option 4: Argentaffin cells$\newline$ - Argentaffin cells are enteroendocrine cells found in the gastrointestinal tract that secrete hormones like serotonin.$\newline$ - They do not secrete lysozyme.$\newline$Based on the analysis, the correct option is:$\newline$Option 1: Paneth cells$\newline$This corresponds to the correct option, which is Option 1.