The quality, safety, and efficacy of the new medicines are not known. What does efficacy mean?

Correct Answer: B

Rationale: Efficacy refers to how effective something is. In this context, it refers to the effectiveness of the new medicines. 'Cost' (Choice A) is incorrect as it relates to the price of something, not its effectiveness. 'Quality' (Choice C) is incorrect as it refers to the standard or degree of excellence. 'Usage' (Choice D) is incorrect as it refers to how something is used, not its effectiveness.

Correct Answer: B

Rationale: The correct answer is B: 'To stick to something.' Adhere means to stay attached or stick to something. Choices A, C, and D are incorrect. Choice A 'To ignore something' is the opposite of adhere, choice C 'To go against something' means to oppose rather than stick to, and choice D 'To pull apart' is the opposite of sticking together.

Correct Answer: B

Rationale: The correct answer is B. A cast is a hard protective device applied to protect a broken bone. Choice A is incorrect as a cast is not a tool used for breaking bones, but rather for supporting and protecting them. Choice C is incorrect as a cast is not a soft bandage but a rigid structure. Choice D is incorrect as a cast is not an instrument used in surgery, but a medical device used for bone support.

Correct Answer: B

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.

Correct Answer: B

Rationale: The correct answer is B: 'To expel feces.' Defecate refers to the act of eliminating solid waste from the body. Choice A, 'To retain feces,' is incorrect as defecation involves getting rid of feces. Choices C and D, 'To eliminate fluid' and 'To excrete mucus,' are also incorrect as they do not accurately define the term 'defecate.'