Pick up the leaf modification
a.Cladode
b.Phyllode
c.Corm
d.Phylloclade
e.Rhizome

Hint: The leaf is a lateral generally flattened structure-borne on the stem. It develops at the node and bears a bud in its axil. In the later stage, the axillary bird is developed into a branch.

Complete answer:
Let's discuss the above option and find the correct answer:
-Cladode: It is a shoot system in which the leaf does not grow but the stem becomes flattened and assumes the photosynthetic function of the plant. It is the modification of the stem.
-Phyllode: It is a modified petiole or leaf stem which appears like a leaf. In some trees, it became flat and wide while the leaf itself reduced completely. The phylloclade also functions as a leaf. Phyllode is a modification of a leaf.
-Corm: It is short, swollen underground plants that play an important role as a storage organ that is used by some plants to survive in winter or extreme conditions. The term corn generally refers to the plants that grow from corms.
-Phylloclade: It is a flat and photosynthetic shoot which is generally known as the modified branches. It contains only one or two nodes and it looks like a leaf.
-Rhizome: It is a modified stem that puts out its root and shoots from its nodes. It develops from the axillary buds and it grows horizontally while it is often called a creeping rootstalk.
Hence, the correct answer is Phyllode.

Note: Leaves are the most important vegetative organs for photosynthesis. Leaves are frequently modified to perform functions other than photosynthesis, they are converted into tendrils for climbing as in peas or into spines for the defence as in cactus.