Correct Answer: C

Rationale: The correct answer is C: indirect Coombs test of the mother. This test is crucial to determine if the mother has developed antibodies against the Rh-positive blood of twin A, which could lead to hemolytic disease of the newborn in future pregnancies. A direct Coombs test of twin A or twin B is not relevant in this scenario as it does not provide information about the mother's antibody status. Transcutaneous bilirubin levels are used to monitor jaundice in newborns and not related to Rh incompatibility. In summary, the indirect Coombs test of the mother is the most relevant test to assess the risk of hemolytic disease in future pregnancies.

Correct Answer: D

Rationale: The correct answer is D because it emphasizes the importance of consistent and correct condom use in preventing HIV transmission. Here's the rationale: 1. Abstinence is the most effective way to prevent HIV, but since the teen is sexually active, abstinence may not be feasible for her. 2. Using condoms consistently and correctly is the next best method for preventing HIV transmission during sexual activity. 3. Choice A is incorrect because it implies that using condoms is not effective, which is not true. 4. Choice B is incorrect because it only mentions female condoms, while both male and female condoms can be effective in preventing HIV. 5. Choice C is incorrect because while new prevention methods are being researched, the established method of consistent condom use remains the most effective.

Correct Answer: B

Rationale: The correct answer is B: Uterine infection. The patient's symptoms of crampy abdominal pain, scant serosanguineous vaginal drainage with odor, negative pregnancy test, and vital signs indicating fever, low blood pressure, and irregular pulse suggest an infection. The history of recent miscarriage raises suspicion for retained products of conception leading to infection. Ectopic pregnancy (choice A) would present with different symptoms such as abdominal pain, vaginal bleeding, and positive pregnancy test. Gestational trophoblastic disease (choice C) typically presents with abnormal vaginal bleeding and high levels of hCG. Endometriosis (choice D) is a chronic condition and not related to the acute symptoms described. In summary, the clinical presentation aligns with uterine infection given the patient's history, symptoms, and vital signs.

Correct Answer: D

Rationale: The correct answer is D: Deficiencies occur when fat intake falls below 10% of daily nutrition. Rationale: 1. Fat is essential for absorption of fat-soluble vitamins (A, D, E, K) and for maintaining healthy cell membranes. 2. Fat provides essential fatty acids (omega-3, omega-6) crucial for brain function and inflammation regulation. 3. Adequate fat intake prevents deficiencies like dry skin, poor wound healing, and hormonal imbalances. 4. A low-fat diet should still include at least 10% of daily nutrition from healthy fats for optimal health. Summary: A: Cholesterol intake is important but not the primary focus for a low-fat diet. B: Fats are significant for health, and extreme low-fat diets can lead to deficiencies. C: While some fats are from external sources, the body needs a minimum amount for proper functioning.

Correct Answer: B

Rationale: The correct answer is B: Pink. In a healthy ear, the tympanic membrane should appear pink due to the rich blood supply. This color indicates good vascularization and normal functioning of the ear. Yellowish-white (choice A), gray (choice C), and bluish-white (choice D) are incorrect because they do not reflect the normal color of a healthy tympanic membrane. Yellowish-white may indicate fluid behind the eardrum, gray may suggest infection or inflammation, and bluish-white could indicate poor blood flow or trauma. Therefore, the pink color of the tympanic membrane is the most appropriate and indicative of a healthy ear in this case.