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People who suffer from excessive drowsiness during the daytime may be victims of a condition known as 'narcolepsy'. While most people may feel sleepy while watching TV or after eating a meal, narcoleptics may fall asleep at unusual or embarrassing times. They may doze while eating , talking, taking a shower, or even driving a car. Victims can be affected in one of two ways. Most narcoleptics have several sleeping spells during each day with alert periods in between. A minority of others feel drowsy almost all the time and are alert for only brief intervals.

There are no reliable data showing how many people have narcolepsy. Some estimates put the number as high as 300,000 in the United States alone. The cause of this illness has not been identified, although recent research suggests that the problem may stem from an immune system reacting abnormally to the brain's chemical processes. There is currently no cure for narcolepsy, so sufferers of this condition can only have their symptoms treated through a combination of counseling and drugs.

According to the passage, it can be said that

a) most people are narcoleptics sometimes.

b) narcoleptics are drug addicts.

c) narcolepsy is a very rare condition.

d) the number of narcoleptics is unknown.

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People who suffer from excessive drowsiness during the daytime may be victims of a condition known as 'narcolepsy'. While most people may feel sleepy while watching TV or after eating a meal, narcoleptics may fall asleep at unusual or embarrassing times. They may doze while eating , talking, taking a shower, or even driving a car. Victims can be affected in one of two ways. Most narcoleptics have several sleeping spells during each day with alert periods in between. A minority of others feel drowsy almost all the time and are alert for only brief intervals.

There are no reliable data showing how many people have narcolepsy. Some estimates put the number as high as 300,000 in the United States alone. The cause of this illness has not been identified, although recent research suggests that the problem may stem from an immune system reacting abnormally to the brain's chemical processes. There is currently no cure for narcolepsy, so sufferers of this condition can only have their symptoms treated through a combination of counseling and drugs.

According to the passage, it can be said that

a) most people are narcoleptics sometimes.

b) narcoleptics are drug addicts.

c) narcolepsy is a very rare condition.

d) the number of narcoleptics is unknown.