This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of protein and amino acid, Subject name: Biochemistry
[{'content': 'In which organelle (s) of hepatocyte, the elongation of long chain fatty acid takes place? \nSelect and explain. \nA. Endoplasmic reticulum (ER), B. Golgi body, C. Mitochondria, D. Lysosomes', 'role': 'user'}, {'content': 'Answer: A \nExplanation: There is two kinds of endoplasmic reticulum (ER): (i) Rough surfaced ER, also known as ergastoplasm. They are coated with ribosomes. Near the nucleus, this type of ER merges with the outer membrane of the nuclear envelope. (ii) Smooth surfaced ER: They do not have attached ribosomes. Function of smooth ER: Smooth endoplasmic reticulum is involved: (i) In lipid synthesis and (ii) Modification and transpo of proteins synthesised in the rough ERRef: M.N. Chatterjea - Textbook of Biochemistry, 8th edition, page no: 7', 'role': 'assistant'}]