Icterus gravis and hydrops fetalis are conditions highly associated with:

Correct Answer: A

Rationale: The correct answer is A: Rhesus D incompatibility. Icterus gravis (severe jaundice) and hydrops fetalis (abnormal accumulation of fluid) are both conditions commonly associated with Rhesus D incompatibility between a mother and her fetus. This occurs when the mother is Rh-negative and the fetus is Rh-positive, leading to maternal antibodies attacking the fetal red blood cells, resulting in severe hemolytic anemia and subsequent complications. Explanation for why other choices are incorrect: B: ABO incompatibility typically leads to less severe jaundice and hemolytic disease compared to Rhesus D incompatibility. C: Physiological jaundice is a common and benign condition in newborns caused by the immaturity of the liver, not by blood type incompatibility. D: Instant perinatal death is not specifically associated with these conditions, but rather with other serious complications during childbirth.

Correct Answer: B

Rationale: In uterine inversion, the fundus is the last part to be replaced due to its position being the deepest inside the vagina. The fundus is the upper portion of the uterus and is the last part to invert back into its normal position. The cervix, isthmus, and body are parts of the uterus that are more easily replaced during the process of uterine inversion. The fundus being the final part to be replaced ensures the uterus is fully restored to its correct orientation.

Correct Answer: D

Rationale: Rationale: 1. Hypoplastic left heart syndrome involves underdevelopment of the left ventricle, aortic valve, and aortic arch. 2. The left ventricle is essential for pumping oxygenated blood to the body. 3. Aortic valve controls blood flow from the left ventricle to the aorta. 4. Aortic arch connects the ascending and descending aorta. Summary: A - Incorrect, as it includes pulmonary veins not related to hypoplastic left heart syndrome. B - Incorrect, as it includes structures not primarily affected in this condition. C - Incorrect, as it does not involve structures related to the left side of the heart.

Correct Answer: A

Rationale: The correct answer is A: Inspiration. Laryngeal stridor is caused by narrowed or obstructed airway, resulting in noisy breathing. During inspiration, the air is drawn through the narrowed larynx, causing the stridor sound. During expiration, the air is leaving the body, so the noise may not be as prominent. Choices C and D, feeding and play, are unrelated to the respiratory process and do not affect the presence of laryngeal stridor.

Correct Answer: C

Rationale: The correct answer is C because radiation and substances of abuse are known teratogenic causes of congenital abnormalities. Radiation exposure can lead to genetic mutations and developmental issues in the fetus. Substances of abuse like alcohol, tobacco, and illicit drugs can also negatively impact fetal development. A: Medical conditions and pesticides may have negative effects on pregnancy outcomes, but they are not typically classified as teratogenic causes of congenital abnormalities. B: Prescription drugs can be teratogenic in some cases, but not all prescription drugs have harmful effects on fetal development. Chromosomes are not typically considered teratogenic causes. D: Disordered genes can lead to congenital abnormalities, but they are not classified as teratogenic causes. Medical conditions are not universally teratogenic.