Which vaccine leaves a permanent scar at the site of injection?

Correct Answer: A

Rationale: The correct answer is A: BCG. BCG vaccine is administered through intradermal injection, leaving a small scar due to the immune response it triggers. The scar formation is a characteristic feature of the BCG vaccine and is used as an indicator of successful vaccination. Other vaccines like DPT, Hepatitis B, and Measles do not typically leave a permanent scar at the injection site. The scar formation with BCG vaccine is a result of the body's immune response to the live attenuated Mycobacterium bovis strain in the vaccine, leading to a localized inflammatory reaction and subsequent scarring.

Correct Answer: B

Rationale: The correct answer is B: Vitamin A. During measles, Vitamin A supplementation is crucial to reduce the risk of complications and improve recovery. Vitamin A deficiency is common in children with measles and can lead to severe outcomes. Tetanus toxoid (A) is not indicated in measles treatment. Vitamin D (C) and Vitamin E (D) do not play a significant role in managing measles symptoms. In summary, Vitamin A is essential for children with measles to prevent complications and support recovery, making it the correct choice among the options provided.

Correct Answer: A

Rationale: The correct answer is A: To prevent anemia. Iron supplementation in pregnant women is primarily aimed at preventing iron-deficiency anemia, a common condition during pregnancy due to increased demand for iron. Anemia can lead to complications for both the mother and the fetus, such as low birth weight and preterm birth. Providing iron helps maintain adequate hemoglobin levels for optimal oxygen transport. Summary of why other choices are incorrect: B: Supporting fetal growth is an important aspect of prenatal care, but iron supplementation specifically targets preventing anemia. C: While iron deficiency may contribute to premature labor, the primary purpose of iron supplementation is to prevent anemia. D: Postpartum hemorrhage risk is more related to factors such as uterine atony and trauma during childbirth, not directly impacted by iron supplementation.

Correct Answer: B

Rationale: The correct answer is B: Liver cancer. The Hepatitis B vaccine prevents Hepatitis B infection, which is a major cause of chronic liver disease and can lead to liver cancer. Jaundice (choice A) is a symptom of Hepatitis B infection, not a disease prevented by the vaccine. Pneumonia (choice C) and Tuberculosis (choice D) are both respiratory infections and are not prevented by the Hepatitis B vaccine. The key is to understand the specific disease targeted by the vaccine and its related health outcomes.

Correct Answer: B

Rationale: The correct answer is B: Vastus lateralis muscle. The vastus lateralis is a recommended site for administration of DPT vaccine in infants and young children. It is a large muscle located in the thigh, providing a well-developed area for injection with minimal risk of hitting nerves or blood vessels. The site is easily accessible, especially for parents or caregivers administering the vaccine. Choice A (Deltoid muscle) is more commonly used in adults, not preferred for infants. Choices C (Gluteus maximus muscle) and D (Abdomen) are not recommended sites for DPT vaccine administration due to potential risk of hitting sciatic nerve in the gluteal region and abdominal organs in the abdomen, respectively.