University of Pavia research in Italy shows Men and women who have just fallen in love issue instructions in the brains that cause people to secrete a chemical substance called a "love hormone" that makes people in love attract each other and produce a hug. A sense of security and satisfaction. Some scientists believe that "love hormones" are the cause of love. Which of the following best supports a scientist's conclusion? ['Stimulation of oxytocin only lasts about one year.', "Injecting a hormonal hormone into the voles' brain makes them more attached to the other half.", 'Pairs of vole also have "one-night stand" and even abandon the other half.', 'Experts are working to treat abnormal diseases, such as tracking mad.']