What is the most common type of arthritis?

Correct Answer: A

Rationale: Osteoarthritis is the most common form of arthritis and typically affects joints through wear and tear over time.

Correct Answer: B

Rationale: Diurnal PEF variability of more than 20% is characteristic of poorly controlled asthma, indicating increased airway reactivity.

Correct Answer: C

Rationale: Hereditary angioedema presents as non-pitting, non-pruritic edema without urticaria, distinguishing it from allergic reactions.

Correct Answer: D

Rationale: The acellular pertussis vaccine is recommended by the American Academy of Pediatrics beginning at age 6 weeks. Infants are at greater risk for complications of pertussis.

Correct Answer: A

Rationale: A history of inflicted trauma is the most direct indicator of physical abuse, though bruises and burn marks are also common signs. Intestinal injury is less frequent and typically indicates severe internal trauma.