Correct Answer: A

Rationale: The correct answer is A, 'Insignificant.' Paltry and insignificant are synonymous terms that denote something as unimportant, trivial, or of little value. Choice B, 'Punitive,' means inflicting or intended as punishment, which is unrelated to the meaning of paltry. Choice C, 'Prolonged,' means continuing for a long time, which is not a synonym for paltry. Choice D, 'Economical,' means giving good value or service in relation to the amount of money, which is not synonymous with paltry.

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: C

Rationale: The jawbone is commonly referred to as the mandible in anatomy. It is the largest and strongest bone in the human face and forms the lower jaw, holding the lower teeth in place. "Mandible" is the correct anatomical term for this specific bone structure.

Correct Answer: D

Rationale: The word 'disintegrates' means to break apart into smaller parts or fragments. In the sentence, it describes the process of the substance breaking down in the mouth. Therefore, the most appropriate meaning is 'Fragments.' 'Evaporates' means to turn into vapor, 'Fizzes' refers to the production of bubbles, and 'Deviates' means to depart from the norm, making them incorrect choices in the context of the sentence.

Correct Answer: D

Rationale: In the given sentence, the word 'establish' is used in the context of identifying or finding out the specific causes of contact dermatitis through patch tests. The most fitting description for 'establish' in this context is 'Determine,' as it signifies the action of figuring out or ascertaining the specific causes. 'Launch,' 'introduce,' and 'endorse' do not capture the essence of what the physicians are doing in this scenario. They are not launching, introducing, or endorsing the causes; instead, they are trying to determine them through the patch tests.