Jan 9 (Reuters) - Andreessen Horowitz has raised more than $15 billion across five new funds, the venture capital giant said on Friday, ​as investor appetite for tech startups surges with the rapid ‌adoption of artificial intelligence. Andreessen Horowitz, also known as a16z, raised$6.75 billion for a fund aimed ‌at scaling up startups, $1.7 billion for an AI infrastructure fund and$1.12 billion for another focused on investing in national interests like defense, housing and supply chain, it said. The ...