Was Reznov actually in Mason's imagination in Black Ops 1?

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Reznov is said to have been a hallucination to Mason after he got captured in Vorkuta. But how could Mason possibly do all those missions alone?
Did Reznov never make it out alive from Vorkuta? There must be some signs of him surviving.
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Is Alex Mason Reznov?
"Reznov", who was actually Mason, began beating Steiner who claimed that killing him would not stop the Nova 6 attacks.Why does Alex Mason see Reznov?
Mason's visions of Reznov are a result of a dissociative disorder caused by the brainwashing program. Prior to the Vorkuta uprising, Reznov reprogrammed Mason to assassinate Dragovich, Kravchenko, and Steiner instead.The Full Story of Viktor Reznov (Black Ops Story)
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Images: RF._.studio, Ketut Subiyanto, Andrea Piacquadio, Ivan Siarbolin