Read this: This narrative draws on the Nidānakathā of the Jataka tales of the Theravada, which is ascribed to Buddhaghoṣa in the 5th century CE. Earlier biographies such as the Buddhacarita, the Lokottaravādin Mahāvastu, and the Sarvāstivādin Lalitavistara Sūtra, give different accounts. Scholars are hesitant to make unqualified claims about the historical facts of the Buddha's life. Most accept that he lived, taught and founded a monastic order, but do not consistently accept all of the details contained in his biographies.

When was the Buddhagohosa written?
What is the answer? (If it cannot be answered, return "unanswerable")
5th century CE