Step 1: Understanding the disease spread by house flies.
House flies are known to spread various diseases. These diseases are often caused by bacteria or viruses that the flies carry on their bodies and legs, transferring them to food and surfaces.
Step 2: Analysis of options.
- (A) Malaria: Incorrect. Malaria is spread by Anopheles mosquitoes, not house flies.
- (B) Small Pox: Incorrect. Smallpox is caused by a virus and is transmitted through direct contact or droplets, not by flies.
- (C) Cholera: Correct. Cholera is a bacterial disease that can be spread by house flies when they come into contact with contaminated food or water.
- (D) Dengue: Incorrect. Dengue is spread by Aedes mosquitoes, not house flies.
Step 3: Conclusion.
The correct answer is (C) Cholera, as it is spread by house flies.
Final Answer:} Cholera.