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.

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 OPV. Oral Polio Vaccine should be stored in the freezer to maintain its potency. Vaccines like DPT, Hepatitis B vaccine, and Measles vaccine are typically stored in the refrigerator to ensure their efficacy.

Correct Answer: D

Rationale: To estimate the number of 1-4 year old children in a population, you can multiply the total population by the percentage of children in that age group. In this case, using the Philippine population composition as reference, which is about 11.5% for 1-4 year olds, the calculation would be 20,000 x 0.115 = 2,300 children.

Correct Answer: A

Rationale: In traditional Chinese medicine, the force characterized by yielding, negative, and feminine aspects is referred to as Yin. Yin is associated with qualities such as darkness, passivity, cold, and intuition. On the other hand, Yang represents the male, dominating, positive, and masculine force associated with light, activity, heat, and logic. Qi is the vital energy that flows through the body, and Chai is not a term used in traditional Chinese medicine for these forces.