Correct Answer: B

Rationale: The correct answer is B: 3000 ml. Polyhydramnios is diagnosed when the amniotic fluid volume exceeds 2000-3000 ml. This amount is considered excessive and can indicate various maternal or fetal health conditions. Choice A (1500 ml) is too low to qualify as polyhydramnios. Choice C (1900 ml) falls within the normal range of amniotic fluid volume. Choice D (2500 ml) is close to the threshold but may not always be considered excessive. Therefore, the correct diagnosis of polyhydramnios is based on an amniotic fluid volume exceeding 3000 ml.

Correct Answer: B

Rationale: The correct answer is B: reduce serum sodium concentration by infusing a 0.45% sodium chloride solution. In hyponatremic hyperosmolality, the primary goal is to correct the low serum sodium levels. A 0.45% sodium chloride solution is hypotonic, which helps to slowly correct the serum sodium concentration without causing rapid shifts in osmolality. Infusing a hypotonic solution will gradually increase the serum sodium levels, addressing the underlying issue. Choices A, C, and D are incorrect because they do not directly address the low serum sodium levels, which is essential in treating hyponatremic hyperosmolality. Infusing a 5% dextrose in 0.2% sodium chloride solution (Choice A) or a 5% dextrose in water solution (Choice D) would not correct the low sodium levels. Replenishing volume with a 0.9% sodium chloride solution (Choice C) would not directly

Correct Answer: A

Rationale: The correct answer is A because immediate cesarean is crucial to prevent further complications and ensure the safety of the mother and baby. Monitoring for signs of shock is essential to detect any deterioration in the mother's condition. Fluid resuscitation helps stabilize the mother's hemodynamic status. Option B is incorrect as observation alone may delay necessary interventions. Option C is partially correct as immediate cesarean is necessary but does not address monitoring for shock and fluid resuscitation. Option D is incorrect as continuous monitoring alone is insufficient to manage incomplete uterine rupture.

Correct Answer: B

Rationale: The correct answer is B: Retroperitoneal bleeding. The physical survey described focuses on assessing for internal bleeding within the retroperitoneal space following a serious motor vehicle accident. The rectovaginal examination, inspection of the urethral meatus, and palpation of pelvic landmarks help evaluate for signs of pelvic fracture and internal bleeding. These assessments help identify potential sources of retroperitoneal bleeding, which can be a life-threatening complication of trauma. Peritoneal bleeding (choice A) involves bleeding within the abdominal cavity, which is less likely in this scenario. Paresthesia (choice C) refers to abnormal sensations like tingling or numbness, which are not typically assessed through physical examination in this context. Pelvic fracture (choice D) is a possible outcome of trauma but does not directly assess for retroperitoneal bleeding.

Correct Answer: C

Rationale: The correct answer is C because partial response in cancer therapy typically refers to a reduction in tumor size by more than 50%. This reduction indicates some positive effect of the treatment on the tumor. Choice A is incorrect because partial response is not solely based on the percentage of patients demonstrating remission, it is about the tumor response. Choice B is incorrect because survival at 5 years is related to overall survival rate, not specifically to the tumor response. Choice D is incorrect because the conversion from unresectable to resectable is more related to the operability of the tumor, rather than the response to chemotherapy.