Which gas is used for cryopreservation

Options :
  1. liquid oxygen
  2. liquid nitrogen
  3. both the above
  4. none of these
Answer and Explanation :-

Answer: Option 2

Explanation:

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She'd stood by that creed. No softness, because the world wasn't soft lots of laughter, because if you were in on the joke, the joke couldn't be on you And no wanting what you couldn't take, because the world never gave.Or so she'd thought.
-Connie Brockway The Bridal Season