Correct Answer: C

Rationale: The correct answer is C: Bulimia. Bulimia involves cycles of binge eating and purging, where individuals may induce vomiting or use laxatives and diuretics. These purging behaviors can lead to significant fluctuations in potassium levels due to electrolyte imbalances caused by excessive loss of potassium through vomiting and purging. In contrast, Binge eating disorder (A) does not involve purging behaviors, so it is less likely to cause significant potassium fluctuations. Anorexia nervosa (B) is characterized by severe food restriction rather than purging, leading to a different pattern of electrolyte imbalances. Purge syndrome (D) is not a recognized eating disorder and is not associated with specific patterns of potassium fluctuations seen in bulimia.

Correct Answer: B

Rationale: The correct answer is B, Hepatitis B. The Hepatitis B vaccine is crucial for pregnant women to prevent transmission of the virus to the baby during childbirth. Option A, MMR (Measles, Mumps, Rubella) vaccine, is not indicated during pregnancy. Option C, Human papillomavirus vaccine, is recommended for prevention of HPV infections but is not specifically indicated during pregnancy. Option D, Pneumococcal vaccine, is important for certain populations but is not the priority vaccine for a pregnant woman in this scenario.

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: In this scenario, the community activities described focus on supporting and promoting overall well-being, which aligns with the concept of health protection. Choice A, disease prevention, is incorrect as the activities are more about supporting health rather than preventing specific diseases. Choice C, risk management, does not fit as the activities are not primarily about managing risks. Choice D, health balance, is not the most appropriate choice as the activities are aimed at protecting and enhancing health rather than achieving a balance.

Correct Answer: C

Rationale: The correct answer is C: Bulimia. Bulimia involves cycles of binge eating and purging, where individuals may induce vomiting or use laxatives and diuretics. These purging behaviors can lead to significant fluctuations in potassium levels due to electrolyte imbalances caused by excessive loss of potassium through vomiting and purging. In contrast, Binge eating disorder (A) does not involve purging behaviors, so it is less likely to cause significant potassium fluctuations. Anorexia nervosa (B) is characterized by severe food restriction rather than purging, leading to a different pattern of electrolyte imbalances. Purge syndrome (D) is not a recognized eating disorder and is not associated with specific patterns of potassium fluctuations seen in bulimia.