Your task is to output a list of selected candidate QA that are the most relevant to the task.

You receive a task, a main QA that is linked task and a list of candidate QA that could be helpful for the task. 
Select a list of candidate QA that are the most relevant to the task. Do not include any candidate QA that are duplicates of the main QA.
if a candidate QA is a duplicate of another candidate QA, include the one that is the most relevant to the task.
DO NOT INCLUDE ANY DUPLICATES IN THE OUTPUT. CONSIDER QA AS DUPLICATES IF THEY HAVE THE SAME QUESTION, THE ANSWER CAN BE DIFFERENT.

Output the list of selected QA.