Family history is the strongest single factor for developing major depressive disorder (MDD) and comorbid disorders are frequently encountered. Of the following, the MOST likely disorder that is associated with MDD is

Correct Answer: B

Rationale: Anxiety disorders are commonly comorbid with MDD, sharing overlapping symptoms and risk factors.

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: A

Rationale: The Modified Duke criteria include positive blood cultures for typical organisms (such as Staph aureus) as a major diagnostic criterion for infective endocarditis.

Correct Answer: A

Rationale: Skin tests are the most effective and commonly used method to detect specific allergens, offering high sensitivity and immediate results compared to blood tests.

Correct Answer: A

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