Correct Answer: D

Rationale: Integrated Management of Childhood Illness (IMCI) is a strategy developed by WHO and UNICEF. The key components of IMCI include integrated case management of childhood illnesses, where healthcare providers are trained to assess, classify, and treat common childhood illnesses holistically. This approach aims to improve the quality of care for children under five years of age by focusing on overall health, nutrition, immunization, and family and community practices. Therefore, promoting hospital-based care, providing routine immunizations, and enhancing maternal nutrition, while important, are not the sole key components of the IMCI strategy.

Correct Answer: B

Rationale: A previous allergic reaction to the vaccine is a contraindication for the administration of live vaccines. This is because individuals who have had a previous allergic reaction to a vaccine are at higher risk of developing a severe allergic reaction with subsequent doses. It is crucial to identify and avoid administering live vaccines to individuals with a history of allergic reactions to prevent potential adverse events.

Correct Answer: C

Rationale: Antiretroviral therapy is a crucial strategy in preventing mother-to-child transmission of HIV. By providing antiretroviral medications to the mother during pregnancy, labor, and breastfeeding, the risk of transmitting the virus to the child is significantly reduced. This treatment approach has been shown to be highly effective in reducing the likelihood of HIV transmission from mother to child.

Correct Answer: B

Rationale: The World Health Organization recommends exclusive breastfeeding for the first 6 months of a child's life. During this time, breast milk provides all the necessary nutrients for the baby's growth and development, offering protection against infections and supporting optimal health outcomes. After 6 months, complementary foods can be introduced while continuing breastfeeding up to 2 years of age or beyond.

Correct Answer: C

Rationale: Vaccination is the most effective method for preventing the spread of infectious diseases as it helps in developing immunity against specific pathogens, reducing the likelihood of infection and transmission within a population. Antibiotics are used to treat infections, not prevent their spread. Quarantine limits the contact of infected individuals but does not provide long-term prevention. Nutritional supplementation can support overall health but is not a primary method for preventing infectious diseases.