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: A

Rationale: The correct answer is A: Entonox. Entonox, a mixture of nitrous oxide and oxygen, is commonly used for inhalational analgesia during labor due to its fast-acting and safe properties. Nitrous oxide provides pain relief without affecting the baby's heart rate or causing sedation. Trilene (B) is not commonly used during labor due to potential side effects on the baby. Oxygen (C) is not an analgesic but is often used in conjunction with Entonox. Nitrous oxide (D) is the active component in Entonox and is the primary analgesic agent in this mixture.

Correct Answer: B

Rationale: Classical vitamin K deficiency bleeding occurs within the neonatal stage because newborns have low levels of vitamin K, which is essential for blood clotting. This deficiency typically manifests between 1-7 days after birth. Bleeding within the first 24 hours (choice A) is unlikely as it is too early for vitamin K deficiency to cause symptoms. Bleeding within infancy (choice C) is incorrect as it specifically refers to the neonatal stage. Bleeding within the first week of birth (choice D) is a close distractor, but the critical period for classical vitamin K deficiency bleeding is within the neonatal stage, which is slightly more specific than the first week of birth.

Correct Answer: B

Rationale: The correct answer is B: CBC with WBC differential. This test can help rule out infectious causes of left lower quadrant pain, such as diverticulitis or colitis, by assessing for elevated white blood cell count and left shift. A CT scan (A) with contrast may be indicated if the patient's condition worsens or if initial tests are inconclusive. Colonoscopy (C) is more appropriate for evaluating chronic or intermittent abdominal pain, not acute symptoms. Barium enema (D) is an outdated test and not commonly used for diagnosing acute abdominal pain.

Correct Answer: A

Rationale: Rationale for correct answer (A): At 36 weeks, the baby has enough room to move, reducing risks of complications during external cephalic version. Earlier intervention also allows for possible repeat attempts if needed. This timing aligns with guidelines for optimal success rates. Summary of other choices: B: 38 weeks may be too late as the baby may have less space to turn. C: 42 weeks is post-term and poses risks for both the baby and the mother. D: 40 weeks is close to full term and may not allow for adequate time for successful version.