Selective medium for Gonococci is
**Core Concept**
Gonococci are fastidious bacteria requiring specific nutrients for growth. A selective medium is used to isolate and cultivate these bacteria while inhibiting the growth of other contaminants. The ideal medium should provide the necessary nutrients, pH, and temperature conditions for the growth of Gonococci.
**Why the Correct Answer is Right**
The correct answer is Thayer-Martin medium, which is a selective medium for the growth of Neisseria gonorrhoeae (Gonococci). This medium contains antibiotics (vancomycin, colistin, nystatin) that inhibit the growth of other bacteria, allowing selective growth of Gonococci. The medium also contains supplements like chocolate agar or hemin to support the growth of these fastidious bacteria.
**Why Each Wrong Option is Incorrect**
**Option A:** Blood agar is a general-purpose medium that supports the growth of many bacteria, including some that might contaminate the culture. It does not provide the selective pressure to inhibit other bacteria.
**Option B:** MacConkey agar is a selective medium for Gram-negative bacteria, but it does not specifically inhibit the growth of other bacteria that might contaminate a Gonococci culture.
**Option C:** Loeffler's serum slope is a medium used for the growth of Corynebacterium diphtheriae, not Gonococci.
**Clinical Pearl / High-Yield Fact**
Thayer-Martin medium is a selective medium that inhibits the growth of other bacteria through the use of antibiotics, making it a crucial tool in diagnosing Gonorrhea.
**Correct Answer:** C. Thayer-Martin medium.