Use a disfluent question or a proper question and find the answer to the question based on the given context or return None if an answer can't be found. A disfluent question is a question that has some interruptions in it while framing. A proper question is the correct form of the question without any disfluency.

proper question: Melatonin during sleep can actively counteract the production of what? 
 disfluent question: Melatonin during sleep can actively counteract the stress uh instead production of what? 
 context: In contrast, during wake periods differentiated effector cells, such as cytotoxic natural killer cells and CTLs (cytotoxic T lymphocytes), peak in order to elicit an effective response against any intruding pathogens. As well during awake active times, anti-inflammatory molecules, such as cortisol and catecholamines, peak. There are two theories as to why the pro-inflammatory state is reserved for sleep time. First, inflammation would cause serious cognitive and physical impairments if it were to occur during wake times. Second, inflammation may occur during sleep times due to the presence of melatonin. Inflammation causes a great deal of oxidative stress and the presence of melatonin during sleep times could actively counteract free radical production during this time.
free radical production
The disfluent question is "Melatonin during sleep can actively counteract the stress uh instead production of what?" The correct question is "Melatonin during sleep can actively counteract the production of what?". The answer to this question would be "free radical production", as melatonin is known to function as an antioxidant..