**Core Concept**
Campylobacter jejuni is a Gram-negative, thermophilic bacterium that requires specific growth conditions. It is a common cause of gastroenteritis in humans, often associated with undercooked poultry or contaminated water.

**Why the Correct Answer is Right**
Campylobacter jejuni is typically cultured on a selective medium that inhibits the growth of other bacteria while allowing the Campylobacter species to thrive. The most commonly used medium for this purpose is Skirrow's medium, which contains ingredients such as polymyxin B, vancomycin, and trimethoprim to suppress the growth of other bacteria. The medium also contains a source of iron, such as ferrous sulfate, which is essential for the growth of Campylobacter jejuni.

**Why Each Wrong Option is Incorrect**
**Option A:** Blood agar is not suitable for the growth of Campylobacter jejuni, as it does not contain the selective agents necessary to inhibit the growth of other bacteria.
**Option B:** MacConkey agar is a selective medium for lactose-fermenting Gram-negative bacteria and is not suitable for the growth of Campylobacter jejuni.
**Option C:** Eosin methylene blue agar is a selective medium for enteric pathogens, but it is not the best medium for the growth of Campylobacter jejuni.

**Clinical Pearl / High-Yield Fact**
Campylobacter jejuni is the most common cause of bacterial gastroenteritis in humans, often associated with undercooked poultry or contaminated water. It is essential to handle and cook poultry safely to prevent the spread of this infection.

**Correct Answer: C. Skirrow's medium**