Correct Answer: A

Rationale: The correct answer is 'Refrain.' 'Refrain' is synonymous with 'abstain,' meaning to hold oneself back. The other choices are incorrect. 'Indulge' means to allow oneself to enjoy the pleasure of something, 'Adhere' means to stick to or follow, and 'Eliminate' means to completely remove or get rid of.

Correct Answer: D

Rationale: The correct answer is D: 'Soon to occur.' The word 'impending' is used to describe something that is about to happen or is soon to occur. In the context of the sentence provided, 'impending' operation indicates that the operation is about to take place. Choices A, B, and C are incorrect because 'impending' does not mean 'very serious,' 'required,' or 'elective.' Instead, it specifically refers to the timing of the operation as being imminent.

Correct Answer: A

Rationale: The correct answer is A: 'Protective device.' A 'cast' is a hard protective device used to support and immobilize a broken bone. It is not a 'medicated sleeve' (B), a 'sling' (C), or a 'bandage' (D), as these items serve different purposes in medical care.

Correct Answer: A

Rationale: The correct answer is 'Chronology,' which specifically means the arrangement of events in the order of their occurrence. 'Notation' refers to a system of symbols or signs used to represent information. 'Documentation' is the process of recording information, while 'Helicon' does not relate to the description of events.

Correct Answer: B

Rationale: The term 'residual' refers to what is left after the main part has been taken or used. In this context, 'residual urine' specifically means the urine that remains in the bladder after urination. Choices A, C, and D do not accurately capture the meaning of 'residual' in this sentence. 'Measurement' (A) is too general, 'Total volume' (C) does not specifically pertain to what remains, and 'Color and clarity' (D) is unrelated to the concept of what is left.