单选题 Of the following signs and symptoms of bowel obstruction, which is related primarily to small bowel obstruction rather than large bowel obstruction?
A. Profuse vomiting.
B. Cramping abdominal pain.
C. Abdominal distention.
D. High-pitched bowel sounds above the obstruction.

【正确答案】 A

【答案解析】Profuse vomiting is the classic sign of small bowel obstruction and rarely occurs with large bowel obstruction.