Correct Answer: B

Rationale: The correct answer is B: Negligence. Negligence refers to the failure to exercise the care that a reasonably prudent person would under similar circumstances. In this case, administering the wrong dose of a vaccine indicates a lack of proper care or attention to detail, which constitutes negligence. A: Battery involves intentional harmful or offensive contact without consent, which is not applicable in this situation. C: Assault involves the threat of harm or unwanted physical contact, which is also not relevant here. D: Malpractice typically refers to professional misconduct or negligence by a healthcare provider, which could be a broader term but not specific to the situation described.

Correct Answer: A

Rationale: The correct answer is A: Central retinal artery occlusion. This condition presents with sudden-onset, painless vision loss, cherry-red spot at the macula due to lack of blood flow, and attenuated retinal vessels. The cherry-red spot is due to the transparency of the fovea when there is ischemia in the surrounding retina. Central retinal vein occlusion (B) presents with sudden vision loss accompanied by retinal hemorrhages and dilated tortuous veins. Retinal detachment (C) typically presents with sudden flashes, floaters, and a curtain-like visual field defect. Acute angle-closure glaucoma (D) presents with severe eye pain, blurred vision, halos around lights, and a fixed mid-dilated pupil.

Correct Answer: D

Rationale: The correct answer is D because informed consent should be obtained from both the participants and their parents to ensure full understanding and agreement from all parties involved. This is crucial when working with minors to protect their rights and ensure ethical standards are met. Choice A is incorrect as it excludes parental consent, which is necessary for minors. Choice B is also incorrect as it neglects the participants' direct involvement in consenting to participate. Choice C is incorrect because it only includes available relatives, which may not be legally authorized to provide consent on behalf of the participants.

Correct Answer: D

Rationale: The correct answer is D: Breastfeeding. HIV transmission from mother to infant can occur through breast milk due to the presence of the virus in breast milk. Other choices such as A: Bathing, B: Bottlefeeding, and C: Washing of vagina do not involve direct contact with potentially infected body fluids like breast milk, making them less likely to transmit the virus. Breastfeeding is a well-documented mode of HIV transmission from mother to infant, hence it is the correct choice in this scenario.

Correct Answer: D

Rationale: The correct answer is D: Tilt the head slightly forward and angle the bottle toward the side of the nostril. This method allows for proper administration of the spray into the nasal passage, ensuring effective delivery of the medication. Tilted head helps direct the spray towards the nasal cavity without causing discomfort or leakage. It also helps prevent the medication from dripping down the back of the throat. Choices A, B, and C are incorrect: A: Finishing instillation in one nostril before moving to the other can lead to uneven distribution of medication and reduced effectiveness. B: Inhaling quickly may cause irritation and discomfort to the mucous membranes due to the forceful intake of the spray. C: Blowing the nose after spraying can expel the medication before it has a chance to be absorbed, decreasing its efficacy.