The disease caused by a virus is known as the common cold, as stated in option 3. Viruses are tiny infectious agents that can infect humans and cause a range of illnesses. The common cold is a viral infection that affects the respiratory system, mainly the nose and throat. It is characterized by symptoms such as sneezing, runny nose, sore throat, and coughing.

Option 1, Typhoid, is caused by the bacterium Salmonella typhi, not a virus. It is a bacterial infection that spreads through contaminated food and water.

Option 2, Cholera, is caused by the bacterium Vibrio cholerae, not a virus. It is also a bacterial infection that spreads through contaminated food and water.

Option 4, Tetanus, is caused by the bacterium Clostridium tetani, not a virus. It is a bacterial infection that affects the nervous system and can result in muscle stiffness and spasms.

In summary, the correct answer is option 3, as it is the only disease listed that is caused by a virus.