Final answer:
Rhonchi, which are coarse breathing sounds, are most commonly caused by pulmonary infection. Blockages due to mucous or lesions in the airways lead to these sounds, and conditions like acute bronchitis or pneumonia are frequent culprits.
Step-by-step explanation:
The common cause of rhonchi, which are coarse rattling respiratory sounds similar to snoring, is B) Pulmonary infection. Rhonchi are caused by blockages to the main airways by mucous, lesions or the abnormal growth of tissue. This symptom is usually detected in patients with chronic respiratory diseases such as chronic bronchitis or cystic fibrosis. However, it can also occur during episodes of acute bronchitis or pneumonia where the airways are temporarily narrowed and filled with mucus.
Illnesses caused by bacteria, which often lead to pulmonary infections, can be treated with antibiotics. Inhaled carcinogens, such as tobacco smoke, can also cause chronic respiratory diseases. A reduction in the number of alveoli often happens due to damage from various conditions like emphysema. The diseases that affect the respiratory system can have numerous triggers and causes, including environmental pollutants, such as air pollution, and pathogens like bacteria, viruses, and fungi. While pneumonia can indeed be caused by bacteria and viruses, it is also true that pneumonia can be caused by fungi.