The human femur is stronger than concrete.
Why it is true
The thigh bone is incredibly dense and structured to support body weight, able to withstand a compressive pressure greater than most types of concrete used in construction.
Source: Biomechanics
Would you rather be asked first?
This is the reading side of the site, so the answer is in the sentence above — that is the whole point of it. Test yourself works the other way round: the question comes on its own, and the fact and the explanation only appear once you have answered.