In which species is Platynosomum concinnum most commonly found?

Platynosomum concinnum is a flatworm, specifically a trematode, commonly known as the "lizard poisoning fluke." This parasite primarily infects cats, particularly in tropical and subtropical regions. Its life cycle involves various hosts, including snails and lizards, which are abundant in these environments.

In cats, the infection can lead to significant health issues, including liver and bile duct damage, hence its relevance in veterinary practices in areas where these conditions are prevalent. The association of Platynosomum concinnum with cats in tropical climates reflects the ecological and geographic distribution of the host species and the fluke's life cycle, making option B the correct choice.

The other species listed, such as dogs, cows, and rabbits, are not common hosts for this particular parasite, as their habitats and ecological interactions differ significantly from those of cats in tropical regions. Thus, they are less likely to exhibit issues related to Platynosomum concinnum infection.