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 :

**Step 1 – Evaluate the Assertion (A).**
The Golgi apparatus receives proteins and lipids that have been synthesized in the endoplasmic reticulum (ER). Its main role is to sort, modify, package, and then dispatch these molecules to their proper destinations inside the cell (e.g., lysosomes, plasma membrane) or outside the cell (secretory vesicles). Therefore the statement that “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” is accurate.

**Step 2 – Evaluate the Reason (R).**
Materials that leave the ER travel in transport vesicles. These vesicles first fuse with the **cis** face of the Golgi stack, where they undergo further modification (e.g., glycosylation). After processing through the medial and trans cisternae, the mature cargo is packed into vesicles that bud from the **trans** face and are sent to their final destinations. Hence the description in R is also correct.

**Step 3 – Determine the relationship between A and R.**
While R correctly describes the **pathway** by which ER‑derived vesicles move through the Golgi, it does **not** explain why the Golgi’s *primary* function is packaging and delivery. R focuses on the mechanics of vesicle fusion and release, not on the purpose of those actions. The primary function (stated in A) is a broader functional description, whereas R supplies a mechanistic detail that does not serve as the causal explanation for that function.

**Conclusion**
Both statements are true, but the Reason does not provide the logical explanation for the Assertion. Therefore the correct choice is “Both A and R are true but R is not the correct explanation of A.”