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: Social & Preventive Medicine
In doubtful cases, the presence of which organism confirms the fecal contamination of Water – 
Select and explain. 
A. Protozoa, B. Yeast, C. Clostridium perfringes, D. Fungi
C: Clostridium perfringes
Answer: C: Clostridium perfringes 
Explanation: None