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
A patient presents with mental confusion, visual and auditory hallucinations, perceived changes of body shape, swelling of the tongue and a fear of impending death after he was treated for primary chancre of syphilis with an intramuscular injection. What is the likely diagnosis? 
Select and explain. 
A. Jarisch-Herxheimer Reaction, B. Hoigne Syndrome, C. Undiagnosed Psychosis, D. Schizophrenia
B: Hoigne Syndrome
Answer: B: Hoigne Syndrome 
Explanation: -Hoigne's syndrome is a pseudoanaphylactic or pseudoallergic reaction that occurs after the intramuscular administration of Penicillin G procaine or benzathine. These are usually embolic toxic reactions possibly due to vascular occlusion by large crystals of the Penicillin salts. It is not due to Penicillin allergy-Acute psychotic symptoms due to a pseudoanaphylactic or pseudoallergic reaction that occurs after the intramuscular administration of Penicillin G procaine or benzathine.-The patient presents with mental confusion, visual and auditory hallucinations, perceived changes of body shape, swelling of the tongue and a fear of impending death.