Correct Answer: D

Rationale: The correct answer is D, 'Parallel.' Parallel play is a common play pattern observed in toddlers where they play alongside each other without direct interaction. This type of play allows toddlers to observe and mimic each other's actions, aiding in their social development. Choices A, B, and C are incorrect. Associative play involves some interaction between children, team play involves organized group activities, and solitary play is when a child plays alone, all of which are not typically exhibited by toddlers during play.

Correct Answer: C

Rationale: The development of a pincer grasp reflects fine motor skills, which develop in a proximodistal pattern (from the center of the body outward).

Correct Answer: B

Rationale: The correct answer is B. Acquired aplastic anemia in children is often caused by exposure to certain drugs, such as chloramphenicol or antiepileptics, which can lead to bone marrow failure and a decrease in all types of blood cells. Choices A, C, and D are incorrect because aplastic anemia is not commonly caused by deficient diet, congenital defects, or injury in children.

Correct Answer: A

Rationale: Thumb sucking is a normal self-soothing behavior in infants and usually does not indicate a problem. Reassuring the mother that this is normal is the appropriate response.

Correct Answer: C

Rationale: Constipation is one of the most common side effects of opioid administration due to the slowing down of gastrointestinal motility. Opioids affect the bowel movements, leading to constipation. Euphoria, while a possible effect, is less common than constipation. Diuresis is not a typical side effect of opioids; instead, urinary retention may occur. Allergic reactions are rare side effects of opioids, with symptoms such as rash, itching, or anaphylaxis.