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: Forensic Medicine
Which of the following is the principal alkaloid obtained from seeds of nux vomica? 
Select and explain. 
A. Cerebrin, B. Strychnine, C. Hyoscyamine, D. Hyoscine
B: Strychnine
Answer: B: Strychnine 
Explanation: Strychnine (kuchila) is a powerful alkaloid obtained from the seeds of strychnos nux vomica. The seeds contain two principal alkaloids; strychnine and brucine. The seeds also contain a glucoside, loganin. Strychnine is 10 to 20 times more poisonous than brucine. Ref: The Essentials of Forensic Medicine and Toxicology by KS Narayan Reddy, 27th edition, Page 545.