This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
Ingestion of raw fish leads to gallbladder cancer due to: 
Select and explain. 
A. Clonorchis sinensis, B. Hyrnenolepis diminuta, C. Angiostrongylus, D. latum
A: Clonorchis sinensis
Answer: A: Clonorchis sinensis 
Explanation: Ans. (a) Clonorchis sinensis Also called as rat lungworm Natural host - Rat, crabs, fresh water prawns and frogs Intermediate host - Molluscs, slugs, and snails Mode of transmission Eating infected molluscs etc. containing third stage larva Pathogenicity Meningoencephalitis by died larvae, so antihelminthic is not recommended Diagnosis Peripheral and CSF eosinophilia Demonstration of larvae/adult worm in CSF Angiostrongylos costaricensis causes inflammation of lower bowel as abdominal angiostrongyliasis Remember: H. diminuta (rat tapeworm) is common parasite of rat and mice. Similar to H. nana in its life cycle but is larger (10-60 cm) than H. nana. Human infection is rare, asymptomatic, occur by accidental ingestion of infected rat fleas. A. Cantonensis is the commnest cause of cosinopholic miningitis.