Whom did Adishankara encounter in the debate on veda shastra ?

Mandana Misra (also spelled Mandana Mishra) was a renowned ritualist philosopher whom Adi Shankaracharya defeated in a famous debate at Mahishi. This debate, with Ubhaya Bharati as the judge, is documented in traditional biographies like the Madhaviya Shankara Vijayam. After losing, Mandana Misra became Shankara's disciple named Sureshvaracharya. Option A (Madana) is a misspelling. Option C (Govindapada) was Shankara's guru, not his debate opponent. Option D (Lord Shiva) is incorrect.