Correct Answer: B

Rationale: The correct answer is B: Surgical removal of the affected section of bowel. Hirschsprung's disease is a congenital condition where a portion of the large intestine lacks nerve cells, leading to difficulties in passing stool. The definitive treatment for this condition is the surgical removal of the affected section of the bowel. Barium enema (Choice A) may be used for diagnosis but is not a treatment. A high-fiber diet (Choice C) is not effective in managing Hirschsprung's disease. A permanent colostomy (Choice D) is not the initial treatment for this condition in infants.

Correct Answer: C

Rationale: The correct answer is C. According to Erikson, the primary task of a preschool-aged child is to explore and assert control over their environment. This behavior is demonstrated by the child opening drawers, pulling out supplies, and examining them, showcasing curiosity and exploration. Choices A, B, and D do not align with the primary developmental task of a preschool-age child according to Erikson. Reading a book and singing a song are more passive activities, while roughhousing with the parent does not directly relate to exploration and asserting control over the environment.

Correct Answer: B

Rationale: The correct answer is B. School-age children are typically able to play structured games with other children and follow the rules of the game. This ability reflects their growing cognitive and social development. Choice A is incorrect as school-age children often engage in group play. Choice C is incorrect as school-age children usually have more autonomy in their play choices. Choice D is incorrect as school-age children tend to form more organized play settings rather than loose groups.

Correct Answer: A

Rationale: The first sign of puberty in boys is typically the enlargement of the testes. This is due to the increase in production of testosterone, which leads to physical changes such as growth of the testes. Choice B, decreased levels of testosterone, is incorrect as puberty is marked by an increase in testosterone levels. Choice C, voice deepening, and choice D, pubic hair growth, usually occur later in the puberty process compared to testicular enlargement, making them incorrect answers.

Correct Answer: B

Rationale: At 10 months, children are beginning to understand simple commands like "no." It is important for parents to reinforce this understanding consistently to help the child learn about boundaries and safety.