This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Epidemiology, Subject name: Social & Preventive Medicine
Toxoid is prepared from 
Select and explain. 
A. Exotoxin, B. Endotoxin, C. Both, D. None
A: Exotoxin
Answer: A: Exotoxin 
Explanation: Ceain organisms produce exotoxins,e.g, diphtheria and tetanus bacilli. The toxins produced by these organisms are detoxified and used in the preparation of vaccine The antibodies produced neutralize the toxic moiety produced during infection, rather than act upon the organism. (refer pgno:105 park 23 rd edition)