Correct Answer: D

Rationale: The correct answer is 'D: Basic.' In this context, 'fundamental' means basic or essential, referring to the core or foundational dissimilarity between the two medications. Choice A, 'Appropriate,' is incorrect as it does not reflect the meaning of 'fundamental' in this sentence. Choice B, 'Underlying,' is incorrect because although it is related, it does not capture the primary or essential nature of the difference being discussed. Choice C, 'Dosage,' is unrelated to the meaning of 'fundamental' and does not align with the context of the sentence.

Correct Answer: D

Rationale: The correct answer is 'D: Discharge.' 'Flux' is a term used to describe the flow or discharge of fluid. Therefore, 'Discharge' is the most appropriate synonym in this context. The other choices are incorrect: A) 'Quantity' refers to an amount, B) 'Inflation' refers to the rise in prices, and C) 'Strength' refers to the power or quality of being strong.

Correct Answer: B

Rationale: The correct answer is 'B: Toddler.' A toddler is a young child typically between the ages of one and three who is just learning to walk. 'Obese' (choice A) refers to excess body fat, 'Geriatric' (choice C) pertains to elderly individuals, and 'Hale' (choice D) means strong and healthy, none of which are descriptive of a small child learning to walk.

Correct Answer: B

Rationale: The correct answer is 'Stimuli.' When forming the plural of 'stimulus,' the correct form is 'stimuli.' Choice A, 'Stimulus,' is the singular form, not the plural. Choice C, 'Stimulis,' is an incorrect spelling. Choice D, 'Stimula,' is also an incorrect form for the plural of 'stimulus.' Therefore, 'Stimuli' is the only correct plural form.

Correct Answer: C

Rationale: The sentence implies a cause-and-effect relationship, so 'because' is the appropriate conjunction. 'Nor' is used in negative constructions, 'Yet' indicates contrast, and 'So' is used to show a consequence, none of which fit the context of the sentence.