Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A): The primary function of the Golgi apparatus is to package the materials made by the endoplasmic reticulum and deliver it to intracellular targets and outside the cell.

Reason (R): Vesicles containing materials made by the endoplasmic reticulum fuse with the cis face of the Golgi apparatus, and they are modified and released from the trans face of the Golgi apparatus.

In the light of the above statements, choose the correct answer from the options given below:

To determine the correct relationship between Assertion (A) and Reason (R), let us analyze both statements individually:

Assertion (A): "The primary function of the Golgi apparatus is to package the materials made by the endoplasmic reticulum and deliver it to intracellular targets and outside the cell."
This statement is biochemically and biologically true. The Golgi apparatus acts as the primary packaging and dispatching unit of the cell. Proteins and lipids synthesized in the endoplasmic reticulum (ER) are sent to the Golgi apparatus, where they are sorted, packaged, and routed to their ultimate destinations, which can be lysosomes, the plasma membrane, or secretion outside the cell.

Reason (R): "Vesicles containing materials made by the endoplasmic reticulum fuse with the cis face of the Golgi apparatus, and they are modified and released from the trans face of the Golgi apparatus."
This statement is also true. Transport vesicles budding off the transition endoplasmic reticulum travel to the cis (receiving) face of the Golgi apparatus and fuse with it, emptying their contents into the lumen. As these molecules progress through the cisternae towards the trans (shipping) face, they undergo various modifications (such as glycosylation or phosphorylation). Finally, they are packed into secretory vesicles and bud off from the trans face.

Analyzing the connection between A and R:
The reason explains how the Golgi apparatus performs its packaging and delivery function (the assertion). Specifically, it receives materials at its cis face from the ER, modifies/packages them as they pass through, and releases them from the trans face for final delivery. Therefore, Reason (R) is the correct explanation of Assertion (A).

Thus, both A and R are true, and R is the correct explanation of A.