What is the primary cause of osteoarthritis?

Correct Answer: C

Rationale: Osteoarthritis is primarily caused by the wear and tear of cartilage over time, leading to joint degeneration.

Correct Answer: A

Rationale: Aspirin for 6 months is sufficient for small aneurysms.

Correct Answer: A

Rationale: Truancy is not considered normal behavior in young children. It often signals deeper issues such as family disorganization, abuse, or risk behaviors like substance use.

Correct Answer: D

Rationale: Noninfectious causes of urethritis do not typically involve trauma or foreign bodies; they more often relate to chemical irritants.

Correct Answer: A

Rationale: Allergic conjunctivitis is the most frequent hypersensitivity response in the eye, triggered by environmental allergens and mediated by IgE.