Correct Answer: B

Rationale: Exogenous means produced outside the body. In this context, 'within the body' (Choice A), 'a byproduct' (Choice C), and 'caused by bacteria' (Choice D) do not accurately define exogenous. The correct definition of exogenous specifically refers to something originating or produced externally.

Correct Answer: C

Rationale: Consistency refers to the quality of staying the same in behavior or level. Thickness is a synonym for consistency as it implies a state of being dense, compact, or solid throughout, which aligns with the idea of staying the same. Conversely, appearance, volatility, and color do not directly relate to the concept of consistency. 'Appearance' refers to how something looks, 'volatility' refers to how easily something changes, and 'color' refers to the hue or shade of something, none of which capture the essence of consistency.

Correct Answer: A

Rationale: The word "ubiquitous" means present, appearing, or found everywhere. Another word that closely relates to this meaning is "widespread," which also refers to something that is prevalent or found in many places. The other choices, such as "last demand," "uncertainty," and "finally reckoned," do not accurately represent the synonym for "ubiquitous."

Correct Answer: B

Rationale: The correct answer is B, 'Destructive.' Pernicious is an adjective that describes something that is extremely harmful or destructive. Choice A, 'Harmless,' is the opposite of pernicious. Choice C, 'Helpful,' is a positive term and does not align with the meaning of pernicious. Choice D, 'Harmful,' is a similar term to pernicious but lacks the emphasis on the severe and damaging nature of the word.

Correct Answer: A

Rationale: The correct answer is 'under' as it is commonly used to describe the state of being affected by anesthesia. The patient is 'under' anesthesia, not 'within,' 'with,' or 'over' it. 'Within' typically refers to being inside something, 'with' indicates being accompanied by something, and 'over' suggests being above or on top of something. Therefore, in the context of the sentence, 'under' is the most appropriate choice.