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
[{'content': 'Which of the following is a "water scarce disease"? \nSelect and explain. \nA. Trachoma, B. Leprosy, C. Rabies, D. Tetanus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Many diseases are caused by scarcity of water in enough amount to be able to maintain personal hygiene and cleanliness. These are called water scarce disease or water washed disease. Examples include trachoma, conjunctivitis, lice infestation, scabies, ascariasis etc. Ref: Park, 21st Edition, Page 657.', 'role': 'assistant'}]