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Jaw clenching is recognized as a sign of MDMA intoxication because this substance, a psychoactive drug known for its stimulant and empathogenic effects, can lead to increased muscle tension and involuntary movements. Users often report experiencing tightness in the jaw and may be seen grinding their teeth or clenching their jaw. This is linked to the drug's impact on the central nervous system, where it stimulates the release of neurotransmitters such as serotonin, dopamine, and norepinephrine.

The other options, while they may describe symptoms associated with various drug intoxications, are not specifically linked to MDMA. Extreme drowsiness is more commonly associated with depressants rather than the stimulating effects of MDMA. Euphoria is indeed a common effect of MDMA, but it is not typically described as a physical sign like jaw clenching. Delirium is associated with more severe forms of intoxication or withdrawal from various substances and is not characteristic of MDMA intoxication.