Is the Aspirin Produced by World's Best Pharmaceutical Company Better

Multiple Choice

Is the aspirin produced by World's Best Pharmaceutical Company better than that of a competitor at relieving headaches? 200 headache suffers are chosen at random.Migraned Testing Service administers the experiment and provides the results evaluation.Three levels are made: participants receive contents from Bottle A, Bottle B, or Bottle C) .Other than the fact that one bottle contains placebo aspirin, no other information is given to the testing service regarding the bottles' contents.

A) Single blind, only evaluator is blinded
B) Double blind
C) Single blind, only participant is blinded
D) Neither