**Core Concept**
The process of translocation in protein synthesis refers to the movement of the ribosome along the mRNA molecule, allowing for the sequential addition of amino acids to the growing polypeptide chain. This process is crucial for the accurate synthesis of proteins.

**Why the Correct Answer is Right**
The correct answer is Chloramphenicol, which is a bacteriostatic antibiotic that inhibits protein synthesis by binding to the 50S subunit of the bacterial ribosome. By doing so, it blocks the translocation step of protein synthesis, preventing the movement of the ribosome along the mRNA molecule. This leads to a misaligned ribosome, which is unable to add new amino acids to the growing polypeptide chain.

**Why Each Wrong Option is Incorrect**
**Option A:** Tetracycline - While tetracycline does inhibit protein synthesis, it does so by binding to the 30S subunit of the ribosome, preventing the binding of aminoacyl-tRNA to the ribosome, rather than interfering with translocation.

**Option B:** Gentamicin - Gentamicin is an aminoglycoside antibiotic that inhibits protein synthesis by binding to the 30S subunit of the ribosome, causing misreading of the mRNA sequence and incorporation of incorrect amino acids, rather than interfering with translocation.

**Option C:** Penicillin - Penicillin is a beta-lactam antibiotic that inhibits cell wall synthesis by binding to penicillin-binding proteins, rather than interfering with protein synthesis or translocation.

**Clinical Pearl / High-Yield Fact**
Chloramphenicol is a broad-spectrum antibiotic that is effective against a wide range of bacteria, but it can cause serious side effects, including aplastic anemia, and should be used with caution.

**Correct Answer:** C. Chloramphenicol