According to Freud's developmental theory, infancy is a stage of:

Correct Answer: A

Rationale: In Freud's psychosexual development theory, the oral stage is the first stage and occurs during infancy. It focuses on activities involving the mouth, such as sucking and feeding. This stage is crucial for the child's development as it forms the basis for trust and attachment. Choices B, C, and D are incorrect as latency refers to the stage during middle childhood where sexual impulses are suppressed, genitality refers to the final stage focusing on mature sexual relationships, and anality refers to the stage occurring during the toddler years where toilet training plays a significant role.

Correct Answer: C

Rationale: For a 2-day-old neonate, the most suitable method to measure temperature is the axillary method. This approach is considered safe and appropriate for neonates, minimizing the risk of injury. Tympanic temperature measurement may not be as accurate in neonates due to their small ear canals. Oral temperature measurement is not recommended for neonates as they may not be able to hold a thermometer properly in their mouths. Rectal temperature measurement is invasive and carries a higher risk of injury and should be avoided unless absolutely necessary.

Correct Answer: B

Rationale: The correct answer is B: Lack of surfactant. Respiratory distress syndrome (RDS) in preterm infants is primarily due to a lack of surfactant, which is crucial for keeping the lungs inflated. Without adequate surfactant, the alveoli collapse, leading to breathing difficulties. Choice A, Excessive surfactant, is incorrect as RDS is caused by an insufficient amount of surfactant. Choice C, Immature immune system, and Choice D, Lack of body fat, are not directly related to the development of respiratory distress syndrome in preterm infants.

Correct Answer: B

Rationale: The correct answer is B, symbolic functioning. Symbolic functioning refers to children using objects, actions, or ideas to represent other objects, actions, or ideas. In this scenario, pretending a sheet is a cape to mimic a superhero demonstrates the child's ability to engage in symbolic play. Choice A, artificialism, is incorrect as it refers to the belief that inanimate objects have lifelike qualities. Choice C, critical thinking, does not directly relate to the imaginative play described in the question. Choice D, dramatic play, is close but not as precise as symbolic functioning, which specifically highlights the use of objects to represent something else.

Correct Answer: C

Rationale: Osteosarcoma is typically treated with a combination of surgery and chemotherapy. This approach aims to remove the tumor and reduce the risk of metastasis. Amputation of the affected extremity may be necessary in some cases to ensure complete removal of the tumor. Intensive radiation is not the primary treatment for osteosarcoma, and bone marrow transplantation is not the standard treatment for this type of cancer.