NTCIR-18 MedNLP-CHAT Determining Medical, Ethical and LegalRisks in Patient-Doctor Conversations: Task Overview. - Eiji Aramaki; Shoko Wakamiya; Shuntaro Yada; Shohei Hisada; Tomohiro Nishiyama; Lenard Paulo Tamayo; Jingnan Xiao; Axalia Levenchaud; Pierre Zweigenbaum; Christoph Otto; Jerycho Pasniczek; Philippe Thomas 001; et al. (NTCIR, 2025)