Read the passage and answer the question.
Passage: The placebo effect demonstrates the power of the mind over the body. When patients receive an inactive substance — such as a sugar pill — but believe it is a real medication, they sometimes experience genuine improvements in symptoms. This occurs across a range of conditions, from pain to anxiety. Remarkably, research has shown that placebos can even work when patients know they are taking a placebo, suggesting the effect may involve learned automatic responses.
What is most surprising about recent placebo research, according to the passage?
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A
Placebos only work for psychological conditions, not physical ones.
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B
The placebo effect can occur even when patients know they are receiving a placebo.
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C
Sugar pills have been found to contain undiscovered active ingredients.
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D
Doctors routinely prescribe placebos in modern medicine.