AI See What You Did There - The Prevalence of LLM-Generated Answers in MOOC Responses. - Petteri Nurmi; Musfira Khan; Zahra Safaei; Ngoc Thi Nguyen; Fatemeh Sarhaddi; Mika Tompuri; Henrik Nygren; Päivi Kinnunen; Agustin Zuniga (SIGCSE (1), 2026)