Correct Answer: A

Rationale: The correct answer is A: Availability of clean fresh water to wash hands after work. Proper hand hygiene, including washing hands with clean water, is crucial in preventing dermatitis, especially in farm workers who are exposed to potential irritants in their work environment. While proper housing (choice B), access to health care services (choice C), and access to transportation (choice D) are important factors in overall community health, they are not directly linked to preventing dermatitis in this scenario.

Correct Answer: B

Rationale: The correct answer is B. Single drug therapy is not appropriate for TB due to the risk of developing resistance. The most effective approach to TB treatment is a combination of 3-4 anti-TB drugs. This combination helps to prevent the development of drug resistance and improve treatment outcomes. Choice C is correct as TB treatment, when completed successfully, renders patients non-infectious and cured. Choice D is also correct as tuberculosis is indeed a curable disease with appropriate treatment. Therefore, the incorrect statement is B.

Correct Answer: A

Rationale: The correct answer is A: Availability of clean fresh water to wash hands after work. Proper hand hygiene, including washing hands with clean water, is crucial in preventing dermatitis, especially in farm workers who are exposed to potential irritants in their work environment. While proper housing (choice B), access to health care services (choice C), and access to transportation (choice D) are important factors in overall community health, they are not directly linked to preventing dermatitis in this scenario.

Correct Answer: A

Rationale: When a community health nurse suspects that an infant is being physically abused, the best course of action is to follow agency protocols to report the suspected abuse. This is essential to ensure that the appropriate authorities are informed, and proper interventions can be initiated. Reporting suspicions to the local child abuse reporting hotline (Choice B) can be a part of the agency protocols but may not cover all necessary steps. Educating the child's caregivers about growth and development (Choice C) is not appropriate in cases of suspected abuse, as the immediate focus should be on the safety and well-being of the infant. Calling the police department to have the child removed from the home (Choice D) is not the primary role of the nurse; the proper authorities should handle the removal process after an investigation.

Correct Answer: A

Rationale: The correct answer is A: Insufficient oxygenation of the cardiac muscle. Myocardial infarction pain is primarily caused by inadequate oxygen reaching the heart muscle, leading to ischemia and tissue damage. Choices B, C, and D are incorrect because circulatory overload, left ventricular overload, and electrolyte imbalance are not the primary causes of chest pain in myocardial infarction. Circulatory overload may lead to other symptoms like edema, left ventricular overload can result in heart failure symptoms, and electrolyte imbalance may present with various manifestations, but none of these directly cause the characteristic chest pain associated with an MI.