Cherry pits contain compounds that release cyanide.
Why it is true
Cherry, plum and apricot pits contain amygdalin, a compound that releases small amounts of cyanide when ingested and digested. A person would need to chew dozens of pits to suffer serious toxic effects.
Source: American Chemical Society
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.