Please solve this.

Question 3 (Unit 11) 5 marks Rheumatoid arthritis is a common, chronic condition that causes symptoms such as joint pain and restricted movement of the joints. Drugs do not cure rheumatoid arthritis, but they may reduce the symptoms. A medical research team wishes to compare the e'icacy of two treatments (drug X and drug Y) that are currently available. It is known that these two treatments will alleviate symptoms only whilst the drug is being taken. Consider the two designs below in turn. Explain how each of the two designs could be implemented in this context and state which you would recommend, justifying your choice. Your answer should discuss any pros and cons for each type of trial. 0 A group-comparative design 0 A crossover design [5]