The most common type of relapse in acute leukemia is:

Correct Answer: B

Rationale: Medullary relapse, or bone marrow relapse, is the most common form of recurrence in acute leukemia due to residual leukemic cells in the bone marrow.

Correct Answer: D

Rationale: Major depression includes core symptoms like weight changes, sleep disturbances, and dysphoric mood. All listed options are possible features of the disorder.

Correct Answer: D

Rationale: Functional abdominal pain, such as irritable bowel syndrome, commonly presents as recurrent periumbilical pain without organic pathology. Red flag symptoms include weight loss, dysphagia, and nocturnal symptoms, which suggest an organic cause.

Correct Answer: D

Rationale: Arsine gas causes massive hemolysis due to red blood cell destruction, leading to anemia and hemoglobinuria.

Correct Answer: D

Rationale: Major depression includes core symptoms like weight changes, sleep disturbances, and dysphoric mood. All listed options are possible features of the disorder.