Concept:
Most members of Liliaceae possess bisexual flowers.
Step 1: Recall exceptions within the family.
Normally flowers are:
\[
\text{Bisexual} + \text{Actinomorphic}
\]
However, some genera show unisexual flowers.
Step 2: Identify the exceptional genera.
The standard NCERT example is:
\[
\boxed{\text{Ruscus and Smilax}}
\]
Hence option (D) is correct.