**Question:** All of the following are true about the therapy of tuberculosis except:

A. Anti-tuberculosis therapy is administered for a minimum of 6 months.
B. Drug resistance is a concern in tuberculosis treatment.
C. The therapy consists of a single drug, Isoniazid.
D. Treatment failure is a common occurrence.

**Core Concept:** Tuberculosis (TB) is an infectious disease caused by Mycobacterium tuberculosis, primarily affecting the lungs. The standard treatment for pulmonary tuberculosis involves a combination of four first-line drugs: Isoniazid, Rifampicin, Ethambutol, and Pyrazinamide. The therapy is typically administered for a minimum of 6 months.

**Why the Correct Answer is Right:**

The correct answer, "Therapy consists of a single drug, Isoniazid," is incorrect because tuberculosis treatment involves a combination of drugs, including Isoniazid, Rifampicin, Ethambutol, and Pyrazinamide. Administering multiple drugs helps reduce the risk of drug resistance and treatment failure.

**Why Each Wrong Option is Incorrect:**

A. While the correct duration of therapy for pulmonary tuberculosis is indeed a minimum of 6 months, this option is not entirely wrong. However, it is not the only correct answer, as the duration can vary depending on the severity of the disease, patient response, and the presence of drug resistance.

B. Drug resistance is indeed a concern in tuberculosis treatment. The misconception here is that it is not the main reason for the combination therapy. Combining drugs helps ensure that drug-resistant strains are less likely to develop, as well as minimizing the risk of treatment failure.

D. Treatment failure is a concern in tuberculosis treatment. However, the misconception here is that it is the main reason for the combination therapy. Combining drugs helps ensure that drug-resistant strains are less likely to develop, as well as minimizing the risk of treatment failure.

**Clinical Pearl:**

Tuberculosis treatment is a complex process involving several drugs to effectively combat the infection and prevent drug resistance and treatment failure. Combining drugs helps ensure adequate treatment outcomes and minimize the development of drug-resistant strains.