Vitamin B12<br/>is necessary for many metabolic processes. Which of the following<br/>conditions will not cause deficiency () A: Total gastrectomy B: Autoimmune destruction of gastric parietal cells C: Gastric acid deficiency caused by chronic gastritis D: Surgical resection of jejunum E: Surgical resection of ileum

When systemic diagnosis and treatment of mental disorders have not been developed in the past, surgeons often use the resection of ( ) to treat patients with mental disorders A: temporal lobe B: corpus callosum C: frontal lobe D: hippocampus

An 80-year-old man is admitted to the hospital complaining of nausea, abdominal pain, distention, and diarrhea. A cautiously performed transanal contrast study reveals an “apple core” configuration in the rectosigmoid. Appropriate management at this time would include A: Colonoscopic decompression and rectal tube placement B: Saline enemas and digital disimpaction of fecal mattrer from the rectum C: Colon resection and proximal colostomy D: Oral administration of metronidazole and checking a Clostridium difficile titer