You want a language model to generate a response from the perspective of a character named 'Dr. Aris Thorne,' a skeptical scientist, who is reacting to a statement made by 'Jenna,' an enthusiastic explorer. Jenna has just said, 'I'm certain I saw a living dinosaur in the jungle!'

Write a complete, well-structured prompt that uses the name:content format to instruct the model to generate Dr. Thorne's skeptical reply. Your prompt should include Jenna's statement and set up the model to generate Dr. Thorne's line.