Correct Answer: A

Rationale: The patient is likely experiencing thrush, a fungal infection, which can present as white patches on the breast that persist. Nystatin is an antifungal medication commonly used to treat thrush. Therefore, the correct answer is Nystatin. Atropine is not indicated for this condition and is used for different purposes. Amoxil is an antibiotic and would not be effective against a fungal infection like thrush. Lortab is a pain medication and is not appropriate for treating thrush.

Correct Answer: B

Rationale: The correct answer is to inform the mother that the infant's weight gain is normal. Infants typically double their birth weight by 6 months, which is precisely the case here, with the infant's weight increasing from 6 lb 8 oz to 13 lb. This weight gain indicates healthy growth and development. Therefore, there is no need to decrease feedings. The infant should continue with breast milk as it is providing adequate nutrition. Additionally, introducing semisolid foods is usually recommended between 4 and 6 months of age, so there is no indication to delay based on the infant's weight gain.

Correct Answer: A

Rationale: The correct answer is 'vascular perfusion of the tissue or organ.' Drug distribution is primarily determined by how well the circulatory system delivers the drug to various tissues and organs. Adequate perfusion ensures proper distribution of the drug throughout the body. While the salt form (choice B), drug interactions (choice C), and steady state (choice D) can influence drug efficacy and metabolism, they are not as crucial as vascular perfusion for the initial distribution of a drug.

Correct Answer: D

Rationale: In the case of Parkinson's disease, improvement in symptoms may take several weeks of therapy to become noticeable. Therefore, the correct answer is to inform the client that it might take several weeks before they notice improvement. Choice A acknowledges individual variability but does not provide a specific timeframe, making it less reassuring. Choice B suggests deferring the question to the physician, which is not the most supportive response. Choice C is incorrect because improvement in Parkinson's disease symptoms typically does not occur within a few days.

Correct Answer: C

Rationale: According to the Rule of Nines, the right lower extremity accounts for 18% of the total body surface area. The Rule of Nines divides the body into regions, each representing 9% or a multiple of 9%, allowing for a quick estimation of the extent of burns. In this case, the correct answer is 18% as it corresponds to the percentage allocated for each lower extremity. Choices A, B, and D are incorrect as they do not match the standard allocation for the right lower extremity in the Rule of Nines.