Bulla on the leg.

Correct Answer: A

Rationale: The presence of fluid in a bulla on the leg indicates a blister, commonly caused by friction or burns. The fluid acts as a protective cushion for the underlying skin. Pus, on the other hand, is a sign of infection and inflammation, not typically found in a bulla. Therefore, option A is correct as it aligns with the typical presentation and pathophysiology of a bulla. Options B, C, and D are incorrect as pus is not a characteristic feature of a bulla and the other choices are incomplete or irrelevant.

Correct Answer: B

Rationale: The correct answer is B: Knock. Before entering a patient's room, it is crucial to knock to respect the patient's privacy and give them a chance to prepare for your entry. This action demonstrates courtesy, professionalism, and consideration for the patient's personal space. It also helps prevent any potential embarrassment or discomfort for the patient. Choice A (Greet) should come after knocking to establish communication. Choice C (Twist the knob) is incorrect as it is a physical action that should be done after knocking to open the door. Choice D is incomplete.

Correct Answer: B

Rationale: Surface temperature gets cold when the surrounding gets cold because heat naturally flows from warmer areas to cooler areas until thermal equilibrium is reached. When the surrounding temperature decreases, it causes the heat to transfer away from the surface, leading to a decrease in surface temperature. This process follows the fundamental principle of heat transfer known as the second law of thermodynamics. The other choices are incorrect because they do not align with the basic principles of heat transfer and thermodynamics. Choice A, stating that surface temperature gets cold when the environment gets hot, goes against the natural flow of heat. Choice C and D are incomplete and do not provide any logical explanation.

Correct Answer: A

Rationale: The correct answer is A: Diarrhea. Rectal temperature should not be taken when a patient has diarrhea because it can lead to inaccurate readings due to rapid fluctuation in body temperature caused by fluid loss. Diarrhea can impair the body's ability to regulate temperature, resulting in unreliable readings. This can potentially lead to incorrect diagnosis and treatment decisions. Therefore, it is crucial to avoid taking rectal temperature in patients with diarrhea to ensure accurate assessment of their temperature status.

Correct Answer: A

Rationale: The correct answer is A: Position on the left side. When a person ingests poison, placing them on the left side helps prevent aspiration into the lungs. Gravity helps keep the poison in the stomach, reducing the risk of further harm. Placing the person on the right side can potentially lead to the poison moving into the esophagus or airway, increasing the risk of complications. Choices C and D are incomplete, lacking information to assess their validity.