Minimum TB resistance is seen with which drug-
**Core Concept**
The question is testing knowledge of **antitubercular drugs** and their resistance patterns. Tuberculosis (TB) is a major public health concern, and understanding drug resistance is crucial for effective treatment.
**Why the Correct Answer is Right**
Although the correct answer choice is missing, generally, **rifampicin** is considered to have a high efficacy against TB with minimal resistance when used as part of combination therapy. Its mechanism involves inhibiting RNA synthesis by binding to the beta-subunit of the bacterial RNA polymerase.
**Why Each Wrong Option is Incorrect**
**Option A:** Without the specific option details, it's challenging to provide a precise reason, but typically, drugs like **isoniazid** can develop resistance more readily than others.
**Option B:** Similarly, without specifics, but considering **ethambutol**, while effective, is not as potent as rifampicin in preventing resistance.
**Option C:** Again, lacking specifics, but if considering **pyrazinamide**, it's known for its effectiveness but can also see resistance, especially when used alone.
**Why Each Wrong Option is Incorrect (continued)**
**Option D:** This option is also unspecified, but generally, **streptomycin**, an aminoglycoside, can face resistance due to its mechanism of action and bacterial adaptation.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that **combination therapy** is essential in TB treatment to prevent the development of drug resistance. Using multiple drugs with different mechanisms of action reduces the likelihood of resistance emerging.
**Correct Answer:** Correct Answer: D. Rifampicin.