Question. Context: In July 2005, Google acquired Android Inc. for at least $50 million. Its key employees, including Rubin, Miner and White, joined Google as part of the acquisition. Not much was known about the secretive Android at the time, with the company having provided few details other than that it was making software for mobile phones. At Google, the team led by Rubin developed a mobile device platform powered by the Linux kernel. Google marketed the platform to handset makers and carriers on the promise of providing a flexible, upgradeable system. Google had "lined up a series of hardware components and software partners and signaled to carriers that it was open to various degrees of cooperation".

Question: android operating system was acquired by google in?
Answer. July 2005
What step-by-step reasoning justifies that answer?
Reasoning: The relevant sentence in the passage is: In July 2005, Google acquired Android Inc. for at least $50 million.