question: Q:Researchers are studying the effects of a new medication for the treatment of type 2 diabetes. A randomized group of 100 subjects is given the new medication 1st for 2 months, followed by a washout period of 2 weeks, and then administration of the gold standard medication for 2 months. Another randomized group of 100 subjects is be given the gold standard medication 1st for 2 months, followed by a washout period of 2 weeks, and then administration of the new medication for 2 months. What is the main disadvantage of this study design?? 
  {'A': 'Increasing confounding bias', 'B': 'Increasing selection bias', 'C': 'Decreasing power', 'D': 'Hawthorne effect', 'E': 'Carryover effect'},