At which of the following stages, decarboxylation of citric acid takes place?
Isocitrate to α-ketoglutarate
α-ketoglutarate to succinyl CoA
Succinate to fumarate
Both a and b
The decarboxylation of citric acid occurs at two stages in the citric acid cycle (also known as the Krebs cycle or TCA cycle):
Therefore, the correct answer is Option 4) Both a and b, as both the conversion of isocitrate to α-ketoglutarate and α-ketoglutarate to succinyl CoA involves the decarboxylation of citric acid and the release of carbon dioxide.