**Question:** Drug of choice in Amoebic liver abscess besides metronidazole is:

A. Oxytetracycline
B. Penicillin
C. Fluorquinolones
D. Thiamine

**Core Concept:**
Amoebic liver abscess is a type of infection caused by the protozoan parasite Entamoeba histolytica. It commonly presents with symptoms like fever, abdominal pain, and hepatosplenomegaly. The standard treatment for amoebic liver abscess typically involves the use of metronidazole, an antiprotozoal drug. However, in cases where metronidazole is contraindicated or not tolerated, alternative antibiotics may be considered.

**Why the Correct Answer is Right:**
Among the given options, the correct answer is Oxytetracycline. Oxytetracycline is a broad-spectrum antibiotic that inhibits bacterial protein synthesis by binding to the 30S ribosomal subunit, preventing tRNA attachment to the ribosome. This action makes it effective against both gram-positive and gram-negative bacteria, which are commonly associated with secondary infections in amoebic liver abscesses.

**Why Each Wrong Option is Incorrect:**

**A. Oxytetracycline:** Although effective against bacteria, oxytetracycline is not specifically designed to target protozoa like Entamoeba histolytica. Metronidazole is a more appropriate choice for treating amoebic liver abscess due to its antiparasitic activity.

**B. Penicillin:** Penicillin is a beta-lactam antibiotic that inhibits bacterial transpeptidation and is not effective against protozoa. It is not the first choice for treating amoebic liver abscess.

**C. Fluorquinolones:** Fluorquinolones are a class of broad-spectrum antibiotics but are not specifically designed to target protozoa like Entamoeba histolytica. Metronidazole is a more appropriate choice for treating amoebic liver abscess due to its antiparasitic activity.

**D. Thiamine (Vitamin B1):** Thiamine is a B-complex vitamin essential for energy production in the body, particularly in the Krebs cycle. Although not a drug, it is unrelated to the treatment of amoebic liver abscess and should be excluded.

**Why Oxytetracycline is Right:**
Oxytetracycline is a tetracycline antibiotic known for its bacteriostatic action, which inhibits bacterial protein synthesis by binding to the 30S ribosomal subunits and blocking peptide bond formation. This bacteriostatic action of oxytetracycline makes it effective against a broad range of bacteria, but not protozoa like Entamoeba histolytica. As such, metronidazole is the preferred choice for treating amoebic liver abscess due to its antiparasitic activity.

**Core Concept:**
Amoebic liver abscess is a clinical condition caused by the protozoan Entamoeba histolytica. The