Given a question and a context passage, generate the answer having the word or phrase from the context passage. Here, the answer should be a shortest continous span from the passage.

Example Input: Context: Ali Sadiki (born 10 December 1987) is a Zimbabwean professional footballer, who plays as a defender for TP Mazembe in DR Congo. 
 Question: Which sports team is Ali Sadiki playing for?
Example Output: tp mazembe

Example Input: Context: The mechanism of action, pharmacokinetics, and use of flumazenil in benzodiazepine overdose, as well as in the management of other disease states, are reviewed. Flumazenil interacts at the central benzodiazepine receptor to antagonize or reverse the behavioral, neurologic, and electrophysiologic effects of benzodiazepine agonists and inverse agonists. Flumazenil has been studied for a variety of indications, including as an antidote to benzodiazepine overdose and for awakening of comatose patients, reversal of sedation after surgery and in critically ill patients, and management of hepatic encephalopathy. It improves the level of consciousness in patients with benzodiazepine overdose; however, resedation may occur within one to two hours after administration, so repeated doses or a continuous infusion may be required to maintain therapeutic efficacy. It appears to be effective in reversing sedation induced by midazolam or diazepam, and case reports suggest that it is useful in awakening comatose patients, although its clinical utility is questionable. Flumazenil has proved useful in reversing conscious sedation in critically ill patients, although response may be dose dependent. Animal models indicate that flumazenil is of some benefit in hepatic encephalopathy, but until well-designed clinical trials are conducted, hepatic encephalopathy must be considered an investigational indication for flumazenil. Adverse reactions include CNS manifestations, resedation, cardiovascular effects, seizures, and alterations in intracranial pressure and cerebral perfusion pressure. Hepatic dysfunction results in a substantial change in the pharmacokinetic profile of flumazenil; therefore, dosage adjustment may be necessary in patients with hepatic dysfunction or in those receiving medications that alter flumazenil metabolism. Flumazenil has been shown to reverse sedation caused by intoxication with benzodiazepines alone or benzodiazepines in combination with other agents, but it should not be used when cyclic antidepressant intoxication is suspected. It may be beneficial after surgery when benzodiazepines have been used as part of anesthesia and after a diagnostic or surgical procedure when assessment of CNS function is necessary. 
 Question: Which drug should be used as an antidote in benzodiazepine overdose?
Example Output: flumazenil

Example Input: Context: The temperature of the troposphere is highest near the surface of the Earth and decreases with altitude. On average, the temperature gradient of the troposphere is 6.5o C per 1,000 m (3.6o F per 1,000 ft) of altitude. Earths surface is the source of heat for the troposphere. Rock, soil, and water on Earth absorb the Suns light and radiate it back into the atmosphere as heat, so there is more heat near the surface. The temperature is also higher near the surface because gravity pulls in more gases. The greater density of gases causes the temperature to rise. Notice that in the troposphere warmer air is beneath cooler air. This condition is unstable since warm air is less dense than cool air. The warm air near the surface rises and cool air higher in the troposphere sinks, so air in the troposphere does a lot of mixing. This mixing causes the temperature gradient to vary with time and place. The rising and sinking of air in the troposphere means that all of the planets weather takes place in the troposphere. Sometimes there is a temperature inversion, in which air temperature in the troposphere increases with altitude and warm air sits over cold air. Inversions are very stable and may last for several days or even weeks. Inversions form: Over land at night or in winter when the ground is cold. The cold ground cools the air that sits above it, making this low layer of air denser than the air above it. Near the coast, where cold seawater cools the air above it. When that denser air moves inland, it slides beneath the warmer air over the land. Since temperature inversions are stable, they often trap pollutants and produce unhealthy air conditions in cities (Figure 1.1). Smoke makes a temperature inversion visible. The smoke is trapped in cold dense air that lies beneath a cap of warmer air. At the top of the troposphere is a thin layer in which the temperature does not change with height. This means that the cooler, denser air of the troposphere is trapped beneath the warmer, less dense air of the stratosphere. Air from the troposphere and stratosphere rarely mix. Click image to the left or use the URL below. URL: 
 Question: in an inversion
Example Output:
warm air sits over cold air.