This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
A mill-wheel type of murmur during laparoscopy suggests - 
Select and explain. 
A. Tension pneumothorax, B. Intraabdominal bleeding, C. Gas embolism, D. Pre-existing valvular disease
C: Gas embolism
Answer: C: Gas embolism 
Explanation: None