Oral Rehydration Therapy (ORT) is a treatment method that involves replenishing lost fluids and electrolytes in the body through oral means. It is typically recommended for patients who are suffering from dehydration caused by various conditions.

Option 1: Tuberculosis is a disease caused by a bacterial infection in the lungs. While it can cause weight loss and weakness, it does not typically lead to severe dehydration. ORT is not specifically recommended for patients with tuberculosis.

Option 2: Typhoid is a bacterial infection that affects the intestines and can cause high fever, diarrhea, and dehydration. ORT is often used as a supportive treatment to help manage fluid loss in patients with typhoid.

Option 3: Tetanus is a bacterial infection that affects the nervous system and can cause muscle stiffness and spasms. It does not directly cause severe fluid loss or dehydration. ORT is not typically recommended for patients with tetanus.

Option 4: Cholera is a bacterial infection that affects the intestines and causes severe diarrhea and dehydration. ORT is the preferred treatment for patients with cholera as it helps replenish lost fluids and electrolytes.

Therefore, the correct answer is option 4. ORT is recommended for patients suffering from cholera.