The correct answer is D. Hallucination.
A hallucination is a perception in the absence of an external stimulus. Hallucinations can be auditory, visual, tactile, olfactory, or gustatory. They can be caused by a variety of factors, including mental illness, drug use, and medical conditions.
An allusion is a reference to something that is not explicitly stated. Allusions can be made to people, places, events, or ideas. They can be used to add depth and meaning to a text.
An illusion is a false perception that is caused by a physical stimulus. Illusions can be caused by optical illusions, auditory illusions, or tactile illusions. They can also be caused by mental factors, such as expectations or beliefs.
Dyspepsia is a common digestive disorder that is characterized by pain or discomfort in the upper abdomen. Dyspepsia can be caused by a variety of factors, including indigestion, heartburn, and gastroesophageal reflux disease (GERD).
In conclusion, the correct answer to the question “A perception without objective reality” is D. Hallucination.