Correct Answer: A

Rationale: The correct answer is A: Hepatotoxicity. Disulfiram is known to cause hepatotoxicity as a severe adverse effect. This occurs due to the inhibition of aldehyde dehydrogenase, leading to the accumulation of acetaldehyde when alcohol is consumed. Wernicke's aphasia (Choice B) is a language disorder unrelated to disulfiram therapy. Suicidal ideations (Choice C) may be associated with certain medications, but it is not a common adverse effect of disulfiram. Diarrhea (Choice D) is not a typical adverse effect of disulfiram.

Correct Answer: A

Rationale: The correct answer is to apply warm compresses to the mouth. Stomatitis is an inflammation of the mucous lining in the mouth and can be a side effect of chemotherapy. Warm compresses can help soothe the affected area and promote healing. Choice B is incorrect because alcohol-based mouthwash can further irritate the mouth. Choice C is also a good intervention as increasing fluid intake can help keep the mouth moist and promote healing. However, the most direct intervention for soothing and healing the affected area is applying warm compresses. Choice D is incorrect because using a firm toothbrush can be too harsh and cause further irritation.

Correct Answer: A

Rationale: The correct answer is to advise the client to take montelukast once daily at bedtime to maintain therapeutic effects. Choice B is incorrect because montelukast is not typically used for acute asthma management but for chronic treatment. Choice C is incorrect as there are no known interactions between montelukast and dairy products. Choice D is incorrect as it is not safe to double up on doses if the client forgets to take the medication; the missed dose should be skipped and the regular dosing schedule maintained.

Correct Answer: B

Rationale: The correct answer is B: Tendon rupture. Ciprofloxacin belongs to the fluoroquinolone class of antibiotics, which is associated with the adverse effect of tendon rupture. Tendon rupture is a severe but rare side effect that can occur with the use of ciprofloxacin. Educating the client about this potential adverse effect is crucial to promote awareness and early recognition of symptoms, such as tendon pain, swelling, or inflammation. Choices A, C, and D are not typically associated with ciprofloxacin use and are less relevant for client education in this scenario.

Correct Answer: D

Rationale: The correct answer is D, Lactic acidosis. Lactic acidosis is a rare but serious adverse effect of metformin use. Metformin is not known to cause hyperglycemia or hypoglycemia. Diarrhea is a common gastrointestinal side effect of metformin but is not as serious as lactic acidosis, which requires immediate medical attention.