Correct Answer: D

Rationale: The correct answer is D: Fetal macrosomia. Fetal macrosomia, which refers to a baby being significantly larger than average, is an inorganic risk factor for birth injuries because it can lead to difficult delivery and increase the risk of birth trauma such as shoulder dystocia. Maternal short stature (A) is a biological risk factor, not inorganic. Prenatal oligohydramnios (B) refers to low levels of amniotic fluid and is a maternal condition, not an inorganic factor. External cephalic version (C) is a procedure to turn a breech baby and is not a risk factor for birth injuries.

Correct Answer: B

Rationale: The correct answer is B: Ammonia. Ammonia is a primary chemical mediator of hepatic encephalopathy. In patients with chronic liver disease, the liver's ability to detoxify ammonia is compromised, leading to its accumulation in the bloodstream and subsequent neurotoxic effects causing encephalopathy. Gamma-aminobutyric acid (GABA), false neurotransmitters, and serotonin are all implicated in the pathophysiology of hepatic encephalopathy. GABA is involved in neurotransmission, false neurotransmitters are substances that disrupt normal neurotransmission, and serotonin levels are altered in hepatic encephalopathy.

Correct Answer: D

Rationale: The correct answer is D: Breast cancer. The patient's breast cancer is the reason she is ineligible to donate organs. Breast cancer is a contraindication for organ donation due to the risk of cancer transmission to the recipient. Traumatic brain injury (choice B) and renal failure (choice A) are not absolute contraindications to organ donation. Gram-negative infection (choice C) may temporarily disqualify the patient but can be treated, unlike breast cancer. In summary, breast cancer poses the highest risk of organ recipient harm compared to the other medical conditions listed.

Correct Answer: B

Rationale: The correct answer is B: Emergency cesarean section. Emergency cesarean sections can increase the risk of puerperal sepsis due to the urgency of the procedure, which may lead to inadequate sterilization or contamination. Other choices are less directly associated with puerperal sepsis: A may increase the risk of infection, but not specifically puerperal sepsis. C relates to general hygiene practices and D focuses on delays in seeking care, which may affect treatment outcomes but are not direct predisposing factors to puerperal sepsis.

Correct Answer: B

Rationale: The correct answer is B: Assess fetal lung maturity. Amniotic fluid analysis measures the levels of substances like surfactant, which indicates lung maturity. This helps in determining if the fetus is ready for delivery. Other choices are incorrect because amniotic fluid analysis is not primarily used to detect fetal infections (A), determine fetal position (C), or assess placental health (D). These functions are typically achieved through other diagnostic tests or imaging techniques.