This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: parasitology, Subject name: Microbiology
Man - snail - crab man cycle is seen in 
Select and explain. 
A. Paragonimus westermanii, B. Fasciola hepatica, C. Schistosoma mansoni, D. Echinococcus granulosus
A: Paragonimus westermanii
Answer: A: Paragonimus westermanii 
Explanation: ParasiteFirst intermediate hostSecond intermediate hostParagonimus westermaniFresh water snail Crab/ Cray fishDiphyllobothrium latumCopepods (Cyclops)Fresh water fish Clonorchis sinensisSnail Fresh water fish Fasciola hepaticaSnail Aquatic vegetation Fasciolopsis buskiSnail Aquatic vegetation (Ref: K.D Chatterjee 13th edition, p196-198)