Mrs. Engel is a 75-year-old woman with a 40-year history of type 2 diabetes mellitus who was referred for consultation of new-onset visual hallucinations. She describes that she sees pictures of familiar scenes and people but does not hear voices. She is aware that these are not real and during the periods of hallucination she is lucid and alert. She has no cognitive impairment and no past psychiatric history. Her vision has been slowly deteriorating for the past 7 years due to macular degeneration. Which of the following is the most likely explanation for this patient?
a) Disorganized schizophrenia
b) Early sign of Alzheimer dementia
c) Charles Bonnet syndrome
d) Temporal lobe epilepsy