Correct Answer: B

Rationale: The vastus lateralis muscle (located in the thigh) is the recommended site for the administration of the DPT vaccine in infants and young children. This muscle is preferred due to its large muscle mass and lower risk of nerve or blood vessel injury, making it a safe and effective site for vaccine administration.

Correct Answer: A

Rationale: The BCG vaccine is recommended to be given at birth to protect against tuberculosis. It is often administered soon after birth to provide early protection against the disease, especially in areas where tuberculosis is prevalent.

Correct Answer: D

Rationale: Sensitivity is the ability of a diagnostic test to correctly identify individuals with the disease. A test with high sensitivity will rarely give false negative results, as it will detect almost all positive cases. In the context of the given scenario, false negative results indicate that the test is lacking in sensitivity to pick up all cases of pulmonary tuberculosis, leading to some cases being missed.

Correct Answer: B

Rationale: The correct answer is B, the Letter of Instruction No. 949. This instruction was issued by then President Ferdinand Marcos, directing the Ministry of Health (now the Department of Health) to utilize the Primary Health Care approach in planning and implementing health programs. This legal basis established the foundation for implementing Primary Health Care in the Philippines, aligning with the global Alma Ata Declaration's principles.

Correct Answer: B

Rationale: To calculate the crude death rate, divide the total number of deaths (94) by the total population (18,000) and then multiply by 1,000. This gives a crude death rate of 5.2 deaths per 1,000 population.