This instruction describes a step in an experimental process, which includes one action, multiple parameters, and one output. 
Please help analyze the output of this instruction. I will provide a list of potential outputs. You need to assist in determining which of these outputs is most suitable for this instruction. 
Note that you must choose one output from the list. Please output only a string without any explanation.

[Examples]
Instruction: (action="add", reagent="glycoblue", output="");
Potential output list: "RNA", "mRNA"
Output: "RNA"

Instruction: (action="add", concentration="1:10 volume 5 M NaCl", output="");
Potential output list: "a µMACS column", "solution"
Output: "solution"

[Question]
Instruction: [Instruction]
Potential output list: [Input]
Output: