A 9-year-old boy has periods of mania alternating with depression. Of the following, the hallmark of mania associated with this disorder is

Correct Answer: D

Rationale: Grandiosity is a key feature of mania, involving inflated self-esteem or delusions of grandeur.

Correct Answer: A

Rationale: Tension pneumothorax causes obstructive shock by preventing normal venous return to the heart due to increased intrathoracic pressure.

Correct Answer: D

Rationale: Gonococci are not common causes of nosocomial neonatal infections. Group B streptococci, coagulase-negative staphylococci, and Proteus are more frequently implicated.

Correct Answer: D

Rationale: Milrinone is a phosphodiesterase inhibitor primarily used for heart failure, not acute shock, where dopamine and dobutamine improve cardiac output.

Correct Answer: A

Rationale: The correct answer is A because the bones surrounding the posterior fontanel typically fuse and close by age 6 to 8 weeks. This closure is a normal part of infant development.