A 30-year-old researcher has colic & diarrhea. He also has headache and insomnia. His tongue is abnormally red. He is in France performing his research studies. He reports that he frequently goes in a fishing trip in the lakes. He eats some of caught fish lightly grilled on charcoal while still on the boat. Lately, he has itching at the anal area and passes a tape like structure.

What is the most likely pathogen responsible for this condition?