Given the question: Answer the following question given this paragraph: Air pollution is another significant cause of respiratory disease. The quality of the air you breathe can affect the health of your lungs. Asthma, heart and lung diseases, allergies, and several types of cancers are all linked to air quality. Air pollution is not just found outdoors; indoor air pollution can also be responsible for health problems. Q: Air pollution can cause disease of what system by affecting the health of your lungs? Choices: - excretory - digestive - cardiac - respiratory A:
The answer is:
respiratory