What is the fine-grained topic of the following text: Ed-tech startup Byju's has raised $50 million (Rs 332 crore) in a round co-led by Chan Zuckerberg Initiative (CZI), marking the first investment of the philanthropic foundation of Facebook founder Mark Zuckerberg and wife Priscilla Chan in Asia. Only return the topic.
Chan Zuckerberg Initiative's investment in Byju's Ed-tech Startup