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Question 10 Not yet answered Marked out of 12.00 P Flag question Select the Two options that are TRUE statements about clinical trials. Select one or more: Randomisation is used in clinical trials mainly to avoid selection bias, but can also help to facilitate blinding In a double-blind clinical trial, neither the patients receiving the placebo nor the patients receiving the drug under test know whether they are receiving the drug or the placebo. The researchers who assess the outcomes of the treatments do know who received which treatment for ethical reasons. In order to avoid selection bias, in a placebo-controlled matched-pairs clinical trial the first person in each pair must always be given the placebo. In all clinical trials with a matched-pairs design, any two paired individuals must have exactly the same age In a placebo-controlled clinical trial with a crossover design, some patients receive the placebo first and then change over to the drug under test, while others receive the drug first and change over to the placebo