question: What is the lowest altitude where acclimatization or a suit is not needed to prevent sickness in humans ?
answer: of up to 3 km
turker_answer: The lowest altitude where acclimatization or a suit is not needed to prevent sickness in humans is up to 3 kilometers .
rule-based: The lowest altitude where acclimatization or a suit is not needed to prevent sickness in humans is of up to 3 km .