Parasites causing lung infestation are -a) H. nanab) Paragonimus westermaniic) Taenia saginatad) E. granulosuse) E. multilocularis

**Core Concept**
Lung infestation by parasites is a significant public health concern worldwide. The parasites that infect the lungs often cause respiratory symptoms, and their diagnosis requires a thorough clinical evaluation and imaging studies.

**Why the Correct Answer is Right**
Paragonimiasis, caused by **Paragonimus westermanii**, is a tropical disease that leads to lung infestation. The parasite is ingested through undercooked or raw crustaceans contaminated with its eggs. Upon ingestion, the eggs hatch into larvae, which penetrate the intestinal wall and migrate to the lungs via the bloodstream. The larvae then lodge in the lung parenchyma, causing cystic lesions and potentially leading to pulmonary symptoms, including cough, hemoptysis, and chest pain.

**Why Each Wrong Option is Incorrect**
**Option A:** *H. nana* is a tapeworm that primarily infests the small intestine, not the lungs. It is not associated with lung infestation.
**Option C:** *Taenia saginata* is a beef tapeworm that infects the small intestine, but it does not cause lung infestation.
**Option D:** *E. granulosus* is a dog tapeworm that causes cystic echinococcosis, primarily affecting the liver, lungs, and other organs. However, it is not a primary lung infester.
**Option E:** *E. multilocularis* is a fox tapeworm that causes alveolar echinococcosis, primarily affecting the liver, lungs, and other organs. Like *E. granulosus*, it is not a primary lung infester.

**Clinical Pearl / High-Yield Fact**
Paragonimiasis can be diagnosed using imaging studies, such as chest X-rays, which show characteristic cystic lesions in the lungs. Treatment typically involves antiparasitic medications, such as praziquantel or albendazole.

**Correct Answer: B. Paragonimus westermanii.**