Which of the following behaviors indicates that an infant has developed object permanence?

Correct Answer: C

Rationale: During the first 6 months of life, infants believe that objects exist only as long as they can see them. When infants

Correct Answer: A

Rationale: Dermatographism is the most frequent type of physical urticaria, occurring in response to skin pressure or scratching.

Correct Answer: D

Rationale: Perfectionism within the classroom is not a typical risk factor for completed suicides. Common risk factors include prior attempts, substance abuse, family history of depression or suicide, and access to lethal means.

Correct Answer: B

Rationale: Cephalohematoma does not extend across suture lines due to the periosteal attachment. The other statements are true regarding cephalohematoma.

Correct Answer: B

Rationale: Medullary relapse, or bone marrow relapse, is the most common form of recurrence in acute leukemia due to residual leukemic cells in the bone marrow.