This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Drug Abuse, Subject name: Forensic Medicine
Which is not related to alcoholism? 
Select and explain. 
A. Marchiaa syndrome, B. McEwan's sign, C. Magnan symptoms, D. Mallory Weiss syndrome
C: Magnan symptoms
Answer: C: Magnan symptoms 
Explanation: - Marchiaa syndrome: Degeneration of corpus callosum - McEwan's sign: pupils dilated at early stage but contracted at later stage; if stimulation given, pupils dilate then slowly contract - Mallory Weiss syndrome - Tear in distal oesophagus - Magnan symptoms Paraesthesia which feels like a constantly moving foreign body, such as fine sand or powder, under the skin The sign is named after Valentin Magnan. Seen In cocaine abuse.