Detailed Instructions: In this task, you will use your knowledge about language (and common sense) to determine what element the marked number refers to. The numbers are marked with two underlines around them, like: _ number _. Your answer should be chosen from the given text, and should not contain other words.
Q: Dr. Spencer Reid:  Methanol is compositionally speaking , the simplest of the alcohols . It 's actually ubiquitous in the environment . There are small traces of its vapor in the atmosphere , but atmospheric methanol is easily oxidized by sunlight .
Emily Prentiss: Is it toxic ?
Dr. Spencer Reid: Ingesting ten milliliters of it will cause permanent blindness , and as little as _ 30 _ is potentially fatal .
Derek Morgan: Well , these victims had between five and six ounces in their lungs .
Dr. Spencer Reid: You know , if they were immersed in it , they would have died even without ingesting or inhaling it . When absorbed through the skin , it depresses the central nervous system to an unsustainable degree .
Derek Morgan: Well , what 's it used for ?
Dr. Spencer Reid: What is n't it used for ? A solvent , an antifreeze . In World War II , the Germans used it for rocket fuel . It 's used in wine - making . Its most commonplace use however , is in the creation of other chemicals . Methanol can become plastic , plywood , paint , explosives , permanent - press textiles . It 's essentially the chemical used to separate other chemicals from each other .
A:
milliliters