Which of the following disaccharide will not reduce Tollen's reagent?

In (Q), it could be found that both the pyranose rings are attached through their reducing group, hence it will not be hydrolysed, and it can not reduce Tollen's reagent. So (Q) is not a reducing sugar, whereas in (P) one ring is hemiacetal which can be hydrolysed therefore it will be hydrolysed in solution and can reduce Tollen's reagent.