This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Toxicology - 2, Subject name: Forensic Medicine
One of the following toxalbumin is used as terrorist weapon 
Select and explain. 
A. Ricin, B. Abrin, C. Croton, D. Chilly
A: Ricin
Answer: A: Ricin 
Explanation: Ricin obtained from Ricinus communis: most poisonous naturally occurring substances known. Ricin is toxic by numerous exposure routes and its use by terrorists might involve poisoning of water or foodstuffs, inoculation ricin-laced projectiles, or aerosolization of liquid ricin or distribution of powder.