The non-causation of the bill means that after the bill is generated due to a certain basic relationship (such as sale, gift), the rights and obligations on the bill are separated from the cause of the creation or transfer of the bill. The holder of the bill does not need to prove the reason for obtaining the bill, but can claim a certain amount according to the contents recorded on the bill, except for illegally obtaining the bill.
According to the above definition, which of the following options is not the non-causation?
The bill holder obtains the bill right by gift without proving the source of the bill right.