Read this and answer the question. If the question is unanswerable, say "unanswerable".

Many historical linguists view any speech form as a dialect of the older medium of communication from which it developed.[citation needed] This point of view sees the modern Romance languages as dialects of Latin, modern Greek as a dialect of Ancient Greek, Tok Pisin as a dialect of English, and North Germanic as dialects of Old Norse. This paradigm is not entirely problem-free. It sees genetic relationships as paramount: the "dialects" of a "language" (which itself may be a "dialect" of a yet older language) may or may not be mutually intelligible. Moreover, a parent language may spawn several "dialects" which themselves subdivide any number of times, with some "branches" of the tree changing more rapidly than others.

According to this few, what language is Ancient Greek a dialect of?
unanswerable