Correct Answer: C

Rationale: The correct answer is C: 'Abstract thinking.' According to Piaget's theory of cognitive development, adolescents, typically around the age of 12 and older, enter the formal operational stage where they can think abstractly and reason about hypothetical situations. When discussing complex topics like STIs with a 17-year-old student, it is essential to base the teaching plan on abstract thinking. Choice A, 'Sensorimotor reactions,' is incorrect as it pertains to the earliest stage in Piaget's theory (birth to 2 years old) focusing on sensory experiences and physical interactions. Choice B, 'Limited cause and effect understanding,' does not align with the cognitive abilities of a 17-year-old who is capable of more advanced thinking. Choice D, 'Concrete thinking,' is also incorrect as it refers to the stage before formal operations, where individuals think more concretely and struggle with abstract concepts.

Correct Answer: B

Rationale: Heating formula in a plastic bottle in the microwave can cause uneven heating and release harmful chemicals from the plastic.

Correct Answer: C

Rationale: Breastfed infants may need fluoride supplements starting at 6 months if they are not receiving fluoride from other sources, such as drinking water.

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: Being persistent through 10 to 15 minutes of food refusal is recommended to help increase caloric intake in infants with FTT. Establishing a routine and using developmental stimulation can also be helpful, but the priority is ensuring adequate caloric intake.