This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Psychiatry
Hallucinations which occur at the 'sta' of sleep is : 
Select and explain. 
A. Hypnagogic hallucinations, B. Hypnopompic hallucinations, C. Jactatio nocturna capitis, D. Non - specific hallucination
A: Hypnagogic hallucinations
Answer: A: Hypnagogic hallucinations 
Explanation: A. i.e. Hypnagogic hallucinations