<s>[INST] What is pneumonia? [/INST] Pneumonia is a lung infection that can cause inflammation in the air sacs of one or both lungs. The inflammation may be caused by a bacterial, viral, or fungal infection. Pneumonia can be a serious and sometimes life-threatening condition, especially in older adults or people with weakened immune systems. Source: Mid Land Healthcare. Link: https://midlandhealthcare.org/11-most-common-question-around-pneumonia/. Field: Lung Disease. Disease: Pneumonia </s>