<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:During normal respiration in the lungs, oxygen is absorbed into the bloodstream and carbon dioxide is released. The oxygen is used in cells as the final electron acceptor during oxidative phosphorylation, and carbon dioxide is generated during each turn of the tricarboxylic citric acid cycle TCA. Which of the following steps in the TCA cycle generates a molecule of carbon dioxide?? A: Citrate to isocitrate, B: Isocitrate to alpha ketoglutarate, C: Succinyl-CoA to succinate, D: Fumarate to Malate, E: Malate to oxaloacetate,  <response>: This is a question about the tricarboxylic acid TCA cycle, also known as the citric acid or Krebs cycle. It asks which step in the TCA cycle generates a molecule of carbon dioxide CO2. To answer this, we need to know the steps of the TCA cycle and which steps involve decarboxylation - the removal of a carbon dioxide group. The TCA cycle has the following steps:1. Citrate - Isocitrate 2. Isocitrate - Alpha ketoglutarate3. Alpha ketoglutarate - Succinyl CoA 4. Succinyl CoA - Succinate5. Succinate - Fumarate6. Fumarate - Malate7. Malate - OxaloacetateOnly one of these steps involves decarboxylation - the conversion of alpha ketoglutarate to succinyl CoA. This step releases a molecule of CO2.B: Isocitrate to alpha ketoglutarate 