Correct Answer: A

Rationale: During the sustenance and strengthening phase of community organizing, leaders or groups are given training to enhance their abilities in managing their programs. This phase focuses on providing the necessary support and resources to ensure the sustainability and growth of the community initiatives. Training at this stage helps build capacity and empower leaders to effectively lead and manage their programs.

Correct Answer: B

Rationale: Epidemiology is defined as the study of the distribution and determinants of health-related states or events in specified populations, as well as the application of this study to control health problems. This field focuses on identifying patterns and causes of health and disease in order to develop strategies for prevention and control.

Correct Answer: B

Rationale: The statement that single drug therapy is appropriate for TB treatment is incorrect because it is essential to use a combination of 3-4 anti-TB drugs to prevent drug resistance and ensure successful treatment outcomes.

Correct Answer: C

Rationale: Directly Observed Treatment Short Course (D.O.T.S.) is an effective strategy for treating tuberculosis (TB) that involves ensuring patients receive and complete their medication regimen under observation. DOTS aims to cure TB patients, stop resistance to anti-TB drugs, and prevent new infections among children and adults. One of the key advantages of DOTS is that it does not require hospitalization, allowing patients to receive treatment in their communities. Therefore, the statement that DOTS requires hospitalization is incorrect, making option C the correct answer.

Correct Answer: D

Rationale: The four cornerstones of primary health care are active community participation, support mechanisms made available, and the use of appropriate technology. Inter-sectoral linkages, while important, are not part of the four core pillars in primary health care.