Problem: Which of the following comparisons of delirium and dementia is incorrect? A. Alertness is impaired in patients with dementia, and normal in patients with delirium. B. Orientation is impaired in patients with delirium, and impaired late in patients with dementia. C. Thoughts are impoverished in patients with dementia, and disorganized in patients with delirium. D. Sleep-wake cycle is disrupted in patients with delirium, and usually normal in patients with dementia.