Who generates the coinbase transaction?

Who generates the coinbase transaction?

As the wiki article says,

Given just those fields, people would frequently generate the exact same sequence of hashes as each other and the fastest CPU would almost always win. However, it is (nearly) impossible for two people to have the same Merkle root because the first transaction in your block is a generation "sent" to one of your unique Bitcoin addresses.]1

Who generates the coinbase transaction?

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