```
Li Qiao did not conceal her suspicions and, after a moment of silence, she shared her conjecture, "Our tests have found that a certain chemical element can cause chromosomal mutations, very similar to what your sister is experiencing.
Think carefully if, when you lived in the countryside, you had ever come into contact with pesticides or herbicides.
If you're certain you have, please tell us the details, as that would significantly clarify the direction of our research."
Though the mutation was suspected to be caused by the element arsenic, with many chemical elements to consider, it was not yet possible to definitively attribute it to a single element or a reaction caused by a mixture of substances.
At this, Guan Mingyu and Guan Mingchen exchanged puzzled looks, both their faces a picture of confusion.
