Communicable diseases
a. are also known as noninfectious diseases.
b. can only be caught from coughs and sneezes.
c. are caused by lifestyle choices, such as smoking cigarettes.
d. are caught from food, water, animals, another person, or something else in the environment.

The answer is letter D.

Communicable diseases are also known as infectious or contagious diseases. They may come from food, water, animals, another person, or anything that comes from the environment. Airborne viruses, bacteria, blood, and bodily fluids can cause the spread of these diseases. The most common communicable disease is the flu, which can easily spread in an enclosed environment with a recycled circulating air (e.g. air-conditioning). Infectious disease caused by blood contact like HIV/AIDs are also dominant in society.   

There are a couple of answers.you could have an infection, a sti, std, or other problematic health issues.i would recommend going to the doctors, if not, take a shower and wash down there, then wait a couple of days, and if it’s still there, then is when you should go to the nearest or trusted gynecologist of your choice.