Correct Answer: D

Rationale: Urea is the correct answer. It is the crystalline compound formed in the liver from the breakdown of proteins, a byproduct of protein metabolism. Urea is excreted by the kidneys in the form of urine, aiding in the elimination of nitrogenous waste from the body. Uracil (Choice A) is a nitrogenous base found in RNA, not a product of protein metabolism. Urine (Choice B) is the liquid waste excreted by the kidneys but not the crystalline compound resulting from protein metabolism. Ureter (Choice C) is a duct that carries urine from the kidneys to the bladder, not the compound produced from protein metabolism.

Correct Answer: D

Rationale: In this sentence, the word 'quarantine' is used to convey the idea that the patients are isolated or separated from the general population. Quarantine is often implemented to prevent the spread of diseases or infections, and in this context, it implies confinement or isolation to ensure the safety of others. The other choices are incorrect because 'A' refers to specialized medical attention, 'B' refers to a specific medical treatment, and 'C' implies being held against one's will in a rehab facility, none of which capture the meaning of 'quarantine' as used in the sentence provided.

Correct Answer: D

Rationale: The correct meaning of 'disregard' in the sentence provided is 'to ignore.' When someone disregards something, they are choosing not to pay attention to it or consider it important. Choice A, 'Have no opinion about,' is incorrect as disregard implies actively ignoring something rather than having no opinion. Choice B, 'Pay attention to,' is the opposite of disregard. Choice C, 'Care for,' is also the opposite of disregard, as caring for something implies giving it importance and attention.

Correct Answer: A

Rationale: The term septic typically refers to something that is infected or contaminated with harmful bacteria or toxins, often used in the context of septic tanks or infections. Therefore, the correct answer is 'Infected.' Choices B, C, and D are incorrect. Odorous means having a smell, terminal means leading to death or the end of something, and vigorous means strong or energetic. These terms do not capture the essence of septic as being infected.

Correct Answer: B

Rationale: Someone who is heedless is not paying attention or being cautious. Therefore, a patient who is heedless can be described as careless, as they may not be taking proper care or paying attention to important things that affect their well-being. Choice A, 'unlucky,' is incorrect as being heedless is not related to luck. Choice C, 'no longer in care,' is incorrect as it does not accurately reflect the meaning of heedless. Choice D, 'hard of hearing,' is unrelated to the concept of being heedless.