79. Which statement about energy metabolism in patients with type I diabetes mellitus and poor blood glucose control is NOT true? (A) Ketone bodies are mainly derived from the metabolism of glucose-produced acetyl-CoA. (B) Ketone bodies can replace glucose as a cellular energy source. (C) Intermediate products of the Krebs cycle, such as oxaloacetate, are used in gluconeogenesis, leading to an increase in blood glucose. (D) Due to the lack of oxaloacetate, acetyl-CoA cannot enter the Krebs cycle, resulting in its conversion into ketone bodies. (E) Fatty acids are converted into ketone bodies as an alternative energy source in the absence of glucose.