<s>[INST] What is Pneumonia? [/INST] Pneumonia is a chronic lung disease, causing inflammation of alveoli or air sacs in the lungs. During this condition, the air sacs get filled with fluid or pus and this disturbs normal breathing phenomenon. It can be experienced in one or both lungs, and therefore known as single or double pneumonia respectively. Source: Medifee. Link: https://www.medifee.com/faq/pneumonia. Field: Lung Disease. Disease: Pneumonia </s>