Okay, let's tackle this question about Campylobacter. First, I need to remember the key points about this organism. Campylobacter is a common cause of bacterial gastroenteritis. The question is asking which statement is true about it, but the options aren't provided. Hmm, maybe the user forgot to include the options. Wait, looking back, the user provided the correct answer as "C. Ingestion of undercooked poultry is a major risk factor." But the options A to D are missing. Well, maybe the user intended to include the options but they got lost in formatting. Let me proceed with the information I have.

Campylobacter jejuni is the most common species causing infection in humans. It's a microaerophilic, spiral-shaped bacterium. The primary route of transmission is through contaminated food, especially undercooked poultry. Other sources include unpasteurized milk and contaminated water. Symptoms usually include diarrhea, abdominal cramps, fever, and sometimes bloody stools. The incubation period is typically 2-5 days.

Now, the correct answer given is option C, which states that undercooked poultry is a major risk factor. That makes sense because poultry is a common reservoir for Campylobacter. The other options would need to be considered. For example, if an option said that it's transmitted through respiratory droplets, that would be incorrect. Or if an option mentioned that it's a Gram-positive organism, that's wrong because Campylobacter is Gram-negative. Another possible incorrect option could be about treatment—like using penicillin, which isn't effective against Campylobacter. The correct treatment is usually fluoroquinolones or macrolides like erythromycin.

The core concept here is the epidemiology and transmission of Campylobacter. The correct answer is right because poultry is a well-known source. The wrong options would be incorrect for various reasons related to transmission, treatment, or organism characteristics. The clinical pearl is to remember that undercooked poultry is a key risk factor, so prevention through proper cooking is essential.

**Core Concept**
Campylobacter jejuni is a microaerophilic, Gram-negative, spiral-shaped bacterium that causes acute bacterial gastroenteritis. It is a leading cause of foodborne illness globally, with undercooked poultry as the primary transmission vector.

**Why the Correct Answer is Right**
The correct option (C) highlights that ingestion of undercooked poultry is a major risk factor. Campylobacter colonizes the intestinal tracts of poultry and other animals. Contaminated poultry meat, if not cooked to ≥74°C (165°F), allows the organism to survive and infect humans. This accounts for ~25% of sporadic Campylobacter infections in developed countries. The organism adheres to and invades intestinal epithelial cells, causing inflammation and watery/bloody diarrhea.

**Why Each Wrong Option is Incorrect**
**Option A:** *If claiming "Campylobacter is a Gram-positive organism"*, it is incorrect because Campylobacter is Gram-negative, with a thin peptidoglycan layer and outer membrane containing lipopolysaccharide.
**Option B:** *If stating "It is transmitted via respiratory droplets"*, this is false. Campylobacter spreads primarily via the fecal-oral route through

✓ Correct Answer: A. Polar flagella