Where would a human need to check how much oxygen he or she has?\nOptions:\n- space shuttle\n- underwater\n- civilisation\n- spacecraft\n- graveyard
Let's think carefully first. Step-by-step reasoning process:
User
Spacecraft is a vehicle used for travelling in space and as you travel towards higher altitudes oxygen level decreases. In a spacecraft human need to check oxygen levels regularly. So the final answer is spacecraft.
Assistant