Culture media is sterilized by which of the following method?

Correct Answer: A

Rationale: Sterilization of culture media is critical in microbiology to eliminate contaminants. Autoclaving (choice A) uses moist heat under pressure (typically 121°C at 15 psi for 15-20 minutes) to kill bacteria, spores, and viruses, making it the gold standard for sterilizing liquid media like agar or broth. Boiling (choice B) at 100°C can kill vegetative bacteria but not heat-resistant spores, rendering it inadequate for complete sterilization. Hot air oven (choice C) employs dry heat (160-170°C for 2 hours) and is suitable for glassware, not liquid media, as it may evaporate or degrade nutrients. Ionizing radiation (choice D) is effective for heat-sensitive materials (e.g., plastics), but it's less common for routine media preparation due to cost and equipment needs. Autoclaving is the correct answer (A) because it ensures thorough sterilization of culture media, a process nurses and lab personnel rely on to maintain aseptic conditions for accurate diagnostic cultures.

Correct Answer: B

Rationale: Humerus fractures require specific traction. Bryant's traction (choice A) treats femoral fractures in children. Overhead suspension traction (choice B) stabilizes humeral fractures, aligning via arm suspension. Thomas splint (choice C) is for femur fractures. 90-90 traction (choice D) suits femoral shaft issues. B is correct, standard for humerus. Nurses apply it, check alignment, and prevent skin breakdown, aiding healing.

Correct Answer: A

Rationale: The wet-to-dry dressing method (A) is a mechanical debridement technique where a wet gauze is applied to a wound, then dries, adhering to and removing necrotic tissue when peeled off. Surgical debridement (B) involves cutting, not dressings. Option C misrepresents it as a protective dressing, ignoring debridement. Option D describes wet-to-moist dressings, not wet-to-dry. Wet-to-dry targets dead tissue removal, aiding healing in wounds like Imelda's, making A accurate and the best response.

Correct Answer: C

Rationale: Autogenic training (C) is self-suggestion or self-hypnosis, using phrases to induce relaxation (e.g., 'my arms are heavy'). Biofeedback (A) relies on machines, meditation (B) on focus, and visualization (D) on imagery not self-hypnosis. Autogenic training, per Schultz, shifts autonomic responses via mental cues, aligning with the definition, making C correct.

Correct Answer: C

Rationale: Maintaining eye contact (C) is least effective with aggressive clients; it can escalate tension, per de-escalation guidelines. Calm approach (A), expression (B), and isolation (D) soothe or manage behavior. Eye contact may provoke, making C incorrect.