Which of the following is more toxic

Options :
  1. LD50 250
  2. LD50 400
  3. LD50 300
  4. non of these

Answer and Explanation :-

Answer: Option 1


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But it is a blessed provision of nature that at times like these, as soon as a man's mercury has got down to a certain point there comes a revulsion, and he rallies. Hope springs up, and cheerfulness along with it, and then he is in good shape to do something for himself, if anything can be done.
-Mark Twain A Connecticut Yankee in King Arthur's Court