In Spirogyra, pyrenoids are present in

The correct option is chloroplast.

Spirogyra is a genus of filamentous charophyte green algae, named for the spiral or helical arrangement of its chloroplasts.
Within these prominent, ribbon-like, spiral chloroplasts, specialized proteinaceous bodies called pyrenoids are embedded at regular intervals.

Pyrenoids serve as sub-cellular micro-compartments in chloroplasts. They are primarily composed of a protein core containing the enzyme Rubisco (ribulose-1,5-bisphosphate carboxylase-oxygenase), which plays a vital role in carbon dioxide fixation during photosynthesis. Surrounding this protein core is a sheath of starch grains, which are synthesized and stored there as food reserves. Therefore, pyrenoids are structurally and functionally associated directly with the chloroplasts of the cell, rather than the cell wall, cytoplasm, or nucleus.