Some microbes can produce an exotoxin called ______, which can induce the lysis of red blood cells.

• A. enterotoxin
• B. hemolysin
• C. neurotoxin
• D. leukocidin

Answer: (B)

Verified step by step guidance

1. Understand the definition of exotoxins: these are toxins secreted by bacteria that can cause damage to the host by targeting specific cells or tissues.
2. Recall that hemolysins are a type of exotoxin specifically known for their ability to lyse red blood cells (erythrocytes), causing hemolysis.
3. Differentiate hemolysins from other exotoxins listed: enterotoxins affect the intestines, neurotoxins affect nerve cells, and leukocidins target white blood cells.
4. Identify that the exotoxin which induces lysis of red blood cells must be hemolysin, based on its function and target cell type.
5. Conclude that the correct term to fill in the blank is 'hemolysin' because it directly relates to the destruction of red blood cells.