Option 1: Cough-cold - This disease can spread through the air as it is caused by viral or bacterial infections that are easily transmitted through respiratory droplets when an infected person coughs or sneezes.
Option 2: Pneumonia - Pneumonia can be caused by various bacteria, viruses, or fungi, and it can spread through the air when an infected person coughs or sneezes.
Option 3: Tuberculosis - Tuberculosis is a highly contagious bacterial infection that primarily affects the lungs and is spread through the air when an infected person coughs, sneezes, or talks.
Option 4: Cholera - Alert: Correct answer should be Cholera. Cholera is a waterborne disease that is primarily transmitted through contaminated food and water, not through the air.
Therefore, the correct answer is option 4: Cholera.