Correct Answer: D

Rationale: The correct answer is D: Feeling of hopelessness. Adolescents who feel hopeless are at a higher risk of attempting suicide due to a lack of belief in positive outcomes. This feeling can lead to a sense of being trapped and unable to see a way out. Depressed mood (A) can contribute to suicide risk, but specifically feeling hopeless is a more direct predictor. Feeling of euphoria (B) and joyful mood (C) are actually less likely to be associated with suicide attempts, as they may temporarily mask underlying issues or provide a sense of distraction. Hopelessness is a key psychological factor that can lead to suicidal thoughts and behaviors in adolescents.

Correct Answer: C

Rationale: The correct answer is C: Periodically lie in prone position without a neck pillow. This position helps to prevent spinal flexion by promoting extension of the spine and stretching of the hip flexors. Prone positioning also helps maintain alignment of the spine and prevents contractures. Resting in supine position (choice A) with the head elevated does not promote spinal extension. Sleeping only in dorsal recumbent position (choice B) may lead to spinal flexion. Sleeping on either side (choice D) does not specifically address spinal flexion prevention.

Correct Answer: A

Rationale: The correct answer is A: Loss of self-tolerance. This is because autoimmune diseases result from a breakdown in the immune system's ability to distinguish between self and non-self antigens, leading to the production of antibodies against self-antigens. When self-tolerance is lost, immune cells mistakenly target the body's own tissues, causing tissue damage and inflammation. Choice B (Failure of innate immunity) is incorrect because autoimmune diseases are primarily driven by adaptive immunity rather than innate immunity. Choice C (Defective T cell activation) is incorrect as T cells play a critical role in the immune response to self-antigens in autoimmune diseases. Choice D (Impaired phagocytosis) is incorrect as phagocytosis is a mechanism primarily involved in the removal of pathogens, not in the development of autoimmune diseases.

Correct Answer: A

Rationale: In cases of uterine inertia, where weak and irregular contractions are causing slow cervical dilation during labor, administering intravenous oxytocin can help augment contractions and stimulate more effective progress. Oxytocin is a hormone that naturally stimulates uterine contractions and is commonly used in clinical settings to induce or enhance labor. By increasing the strength and frequency of contractions, oxytocin can help address uterine inertia and promote efficient cervical dilation to facilitate the progress of labor. It is important to monitor the response to oxytocin carefully to avoid complications such as hyperstimulation of the uterus, which can lead to fetal distress.

Correct Answer: C

Rationale: The correct answer is C: Acquired von Willebrand syndrome. This condition is characterized by a defect in von Willebrand factor function, leading to prolonged bleeding time and mucocutaneous bleeding. Normal platelet count rules out Glanzmann thrombasthenia and Bernard-Soulier syndrome which are platelet disorders. Normal PT and aPTT rule out Hemophilia A, a coagulation factor deficiency. Acquired von Willebrand syndrome is the most likely cause based on the clinical presentation and laboratory findings.