Correct Answer: A

Rationale: Adolescents who are overweight often struggle with poor body image, which can lead to low self-esteem and mental health issues. Addressing body image concerns and promoting healthy lifestyle changes are important aspects of care. Choices B, C, and D are incorrect. Sexual promiscuity is not a direct psychological effect of being overweight; feelings of contempt for thin peers are not a common or recommended psychological response; lack of independence is a broad term that does not specifically relate to the psychological effects of being overweight.

Correct Answer: C

Rationale: Fluoridated water helps prevent caries, early childhood caries is preventable, and dental hygiene should start with the first tooth eruption.

Correct Answer: D

Rationale: A child with a BMI greater than the 95th percentile is classified as obese, according to standard growth charts used in pediatric practice.

Correct Answer: B

Rationale: The correct answer is B: Chickenpox. Chickenpox is highly infectious and is transmitted through direct contact, droplet spread, and contaminated objects. Due to its high communicability, strict isolation of the patient is necessary to prevent the spread of the disease. Mumps is primarily transmitted through direct contact with the infected person's saliva, with peak contagiousness before the onset of swelling. Exanthema subitum (roseola) has an unknown transmission source. Erythema infectiosum (fifth disease) is contagious before the appearance of symptoms. Therefore, these diseases do not require the same level of strict isolation as chickenpox.

Correct Answer: D

Rationale: The correct answer is D: Chronic hypoxia and iron overload. Children with Beta-thalassemia often suffer from chronic hypoxia due to ineffective erythropoiesis and require frequent blood transfusions, leading to iron overload. These complications must be managed to prevent organ damage. Choices A, B, and C are incorrect. Hypertrophy of the thyroid, polycythemia vera, and thrombocytopenia are not direct risk factors associated with Beta-thalassemia. Therefore, they should not be included in the teaching regarding this condition.