What Did American Researchers Conclude About St

What did American researchers conclude about St. John's wort?

A) St. John's wort was as effective as the synthetic medications on the market
B) St. John's wort served no useful purpose as a biological treatment for psychological disorders
C) St. John's wort produced more serious side effects than the SSRIs
D) St. John's wort was no more effective than placebo or SSRIs