**Core Concept**
Brucellosis is a zoonotic disease that can be transmitted to humans through contact with infected animals or contaminated animal products, such as unpasteurized milk. This disease is caused by Brucella bacteria, which can be found in the tissues of infected animals.

**Why the Correct Answer is Right**
Brucellosis is a significant public health concern, particularly in regions where animal husbandry practices are not strictly regulated. The bacteria can be transmitted to humans through direct contact with infected animals, consumption of unpasteurized dairy products, or inhalation of aerosols contaminated with the bacteria. The disease can cause a range of symptoms, including fever, headache, and joint pain.

**Why Each Wrong Option is Incorrect**
* **Option A:** Tuberculosis is a zoonotic disease, but it is not typically transmitted through milk.
* **Option B:** Leptospirosis is a zoonotic disease, but it is primarily transmitted through contact with water or soil contaminated with the urine of infected animals.
* **Option C:** Listeriosis is a foodborne illness that can be caused by consuming contaminated food products, including dairy products. However, it is not typically associated with unpasteurized milk.

**Clinical Pearl / High-Yield Fact**
Brucellosis can be prevented through proper handling and pasteurization of dairy products, as well as vaccination of animals in high-risk areas.

**Correct Answer:** C. Listeriosis