A hypothesis that is non-falsifiable is what

Non-falsifiable hypotheses: Hypotheses that are inherently impossible to falsify, either because of technical limitations or because of subjectivity. E.g. "Chocolate is always better than vanilla." [subjective].

A statement, hypothesis, or theory has falsifiability if it can be proven false by contradicting it with a basic statement or observation.

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Explanation:

A hypothesis is hard to be considered "falsified" because it is based on the knowledge that you have and you are making a presumption based on a set of data and then working to prove and backup the hypothesis which could potentially be wrong but isn't falisfied as it is your own conclusion an not a statement    

answer; polycythemia is the correct answer;