Cheeser’s lung is caused by
**Core Concept**
Cheese's lung, also known as farmer's lung, is a type of hypersensitivity pneumonitis caused by the inhalation of spores from thermophilic actinomycetes, which are commonly found in moldy hay, grain, or compost. This condition is an example of an occupational lung disease, where the exposure to specific antigens in the workplace leads to an immune-mediated reaction.
**Why the Correct Answer is Right**
The correct answer is caused by the inhalation of spores from thermophilic actinomycetes, such as Micropolyspora faeni or Saccharopolyspora rectivirgula. These spores are highly resistant to heat and can survive in environments with high temperatures, which allows them to thrive in moldy hay, grain, or compost. When inhaled, these spores trigger an immune response, leading to inflammation and damage to the lung tissue. The condition is characterized by symptoms such as cough, shortness of breath, and chest tightness, which can progress to fibrosis and lung damage if left untreated.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specify the causative agent of Cheese's lung.
**Option B:** This option is incorrect because it is a different type of occupational lung disease caused by silica dust.
**Option C:** This option is incorrect because it refers to a different type of lung disease caused by the inhalation of asbestos fibers.
**Clinical Pearl / High-Yield Fact**
Farmer's lung is often referred to as "Cheese's lung" because it was first described in a group of cheese handlers who developed symptoms after inhaling spores from moldy cheese. This condition highlights the importance of proper ventilation and personal protective equipment in occupational settings where workers are exposed to potential allergens.
**Correct Answer:** D