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:  

The correct answer is Both A and R are true and R is the correct explanation of A

Explanation:

• The Golgi apparatus is an essential component of the cellular endomembrane system responsible for modifying, sorting, and packaging proteins and lipids for secretion or delivery to other organelles.
• The endoplasmic reticulum (ER) is involved in the synthesis of proteins (rough ER) and lipids (smooth ER).
• The Golgi apparatus receives materials from the ER, processes them, and then directs them to their appropriate destinations within or outside the cell.

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 true. The Golgi apparatus processes and packages proteins and lipids synthesized in the ER and sends them to various destinations.
• The golgi apparatus principally performs the function of packaging materials, to be delivered either to the intra-cellular targets or secreted 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 true and provides the correct explanation for the Assertion.
• The Golgi apparatus has a cis face (receiving side) and a trans face (shipping side).
• Vesicles from the ER fuse with the cis face, and the materials within these vesicles are modified, sorted, and packaged as they move through the Golgi to be released from the trans face.
• That's why Golgi apparatus remains in close association with the endoplasmic reticlum.

Therefore, both A and R are true, and R correctly explains A, making the correct answer option 1).