Choose the meaning of the word 'intramuscularly' in the following sentence: 'This vaccine must only be used intramuscularly and as a single-dose vial.'

Correct Answer: B

Rationale: The word 'intramuscularly' in the sentence indicates that the vaccine should be used by injection directly into the muscles. This means the correct meaning is 'into muscles,' making option B the most suitable choice. Choices A, C, and D are incorrect because 'intramuscularly' specifically refers to administering something inside the muscle, not between muscles, without muscles, or on top of muscles.

Correct Answer: A

Rationale: The word 'derivative' in this sentence means that the professor's lecture was not original, but instead heavily based on or closely imitating something else. Therefore, the correct meaning is 'unoriginal.' Choices B, C, and D are incorrect. 'Monotonous' means lacking in variety and boringly repetitive, 'condescending' means showing a superior attitude, and 'long-winded' means using more words than necessary.

Correct Answer: D

Rationale: The correct answer is D, 'Emotional behavior.' Histrionics refer to exaggerated or dramatic emotional behavior, often characterized by theatricality or over-the-top expressions of emotions. It is more related to dramatic and exaggerated emotional displays rather than accomplishments, daring acts, or examinations. Choices A, B, and C are incorrect because histrionics specifically pertain to emotional behavior and not achievements, daring actions, or assessments.

Correct Answer: D

Rationale: The word 'contravene' in this sentence means to go against or disobey. Therefore, the correct meaning is closest to 'disregard.' The interns did not follow or comply with the doctor's orders, indicating that they contravened them. 'Comply with' (Choice A) is the opposite of 'contravene,' 'misjudge' (Choice B) and 'comprehend' (Choice C) do not accurately reflect the meaning of 'contravene' in this context.

Correct Answer: C

Rationale: In the context of the sentence, the word 'placebo' refers to a substance or treatment that resembles a real medical treatment but has no therapeutic effect. It is used as a standard against which the effects of the experimental drug are compared. A placebo is typically included in a control group in medical research to evaluate the actual effects of the experimental drug. Therefore, in this scenario, the placebo serves as a control to gauge the effectiveness of the experimental drug, making choice C the correct answer. Choices A, B, and D are incorrect because a placebo is not a fallback, substitute, or curative treatment in this context.