Which of the following is a common feature of giant cell arteritis?

Correct Answer: D

Rationale: Giant cell arteritis can cause headache, jaw claudication, and vision loss due to temporal artery inflammation, making 'All of the above' the correct answer.

Correct Answer: D

Rationale: Vitamin D deficiency is linked to immune dysfunction and worsened atopic dermatitis.

Correct Answer: B

Rationale: Prematurity is the leading cause of low birthweight in the United States

Correct Answer: B

Rationale: Prostaglandin E1 maintains the patency of the ductus arteriosus, allowing blood to bypass obstructed or underdeveloped pulmonary circulation, improving oxygenation in cyanotic congenital heart diseases like pulmonary atresia or transposition of the great arteries.

Correct Answer: A

Rationale: Obstructive shock results from physical blockage of blood flow, such as cardiac tamponade or pulmonary embolism, impairing ventricular output.