This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
Saturated fatty acids containing up to 16 carbon atoms are assembled in 
Select and explain. 
A. Mitochondria, B. Rough endoplasmic reticulum, C. Smooth endoplasmic reticulum, D. Cytoplasm
D: Cytoplasm
Answer: D: Cytoplasm 
Explanation: Cytoplasm

The end product of cytosolic fatty acid synthesis cycles is saturated 16-carbon palmitic acid.
Elongation of pre-existing fatty acid :-
(i) Microsomnal (endoplasmic reticulum) :- Elongation of palmitic acid (16-C) into longer chain fatty acids
(ii) Mitochondrial :- Elongation of short and medium chain fatty acids containing fewer than 16 carbon atoms