**Core Concept**
Hemolytic uremic syndrome (HUS) is a complex condition characterized by the triad of hemolytic anemia, acute kidney injury, and thrombocytopenia. It is often caused by Shiga toxin-producing bacteria, such as E coli.

**Why the Correct Answer is Right**
E coli serotype O157:H7 is a common cause of HUS, producing Shiga toxin 1 (Stx1) and/or Shiga toxin 2 (Stx2). These toxins inhibit protein synthesis in host cells, leading to endothelial damage and microangiopathic hemolytic anemia. The toxin also causes renal vasoconstriction, leading to acute kidney injury.

**Why Each Wrong Option is Incorrect**
**Option A:** This option might be tempting, but other pathogens like Salmonella or Campylobacter can also cause HUS, although E coli is the most common cause.

**Option B:** While Shiga toxin is indeed responsible for the pathogenesis of HUS, the specific toxin produced by E coli is Stx1 and/or Stx2, not Shiga-like toxin.

**Option C:** The mechanism of HUS involves endothelial damage and microangiopathic hemolytic anemia, not direct invasion of the renal parenchyma by bacteria.

**Clinical Pearl / High-Yield Fact**
In cases of suspected HUS, it is essential to investigate for Shiga toxin-producing E coli in the stool, as early antibiotic treatment may reduce the risk of HUS.

**Correct Answer: C.**