Which of the following is NOT mentioned in the passage regarding the Norwegian study on oxytocin? A. The study showed that oxytocin made students more able to distinguish faces from one another. B. Leknes was the lead scientist in the investigation. C. A control dose of salt water was used to gauge normal student ability to recognize facial expressions. D. Students who participated in the study were shown happy, angry, or neutral expressions. E. Oxytocin had the greatest effect on students who were least able to evaluate emotions properly when given the control dose.