Leprosy, also known as Hansen's disease, is caused by the bacterium Mycobacterium leprae. It primarily affects the skin, nerves, and mucous membranes. Leprosy is a chronic infectious disease that is characterized by disfiguring skin lesions, nerve damage, and deformities if left untreated. It is transmitted through prolonged close contact with an infected person.

Diphtheria is caused by the bacterium Corynebacterium diphtheriae. It is a highly contagious respiratory disease that primarily affects the throat and upper respiratory tract. Diphtheria is characterized by the formation of a thick grayish membrane in the throat, which can lead to difficulty breathing and swallowing. It can also cause damage to the heart, nerves, and other organs if left untreated. Diphtheria is transmitted through respiratory droplets from an infected person.

Cholera is caused by the bacterium Vibrio cholerae. It is an acute diarrheal disease that can cause severe dehydration and even death if not treated promptly. Cholera is primarily transmitted through the ingestion of contaminated food or water. The bacteria release toxins in the intestines, leading to the characteristic watery diarrhea.

Tetanus is caused by the bacterium Clostridium tetani. It is a serious bacterial infection that affects the nervous system. Tetanus is characterized by muscle stiffness and spasms, often starting with the jaw muscles (lockjaw) and then spreading to other muscles. It is caused by the introduction of the bacterium into the body through a wound or injury, typically one that is deep and contaminated with soil or other substances.

Influenza, also known as the flu, is caused by the influenza virus. It is a highly contagious respiratory illness that can cause mild to severe symptoms. Influenza is characterized by fever, cough, sore throat, body aches, and fatigue. It is transmitted through respiratory droplets from an infected person.

Typhoid fever is caused by the bacterium Salmonella typhi. It is a bacterial infection that primarily affects the digestive system. Typhoid fever is characterized by high fever, headache, stomach pain, and diarrhea. It is transmitted through the ingestion of contaminated food or water.

In this case, the correct answer is option C, Vibrio comma causes cholera.