Methamphetamine (crystal meth, MDMA) is a hallucinogenic stimulant which (in high doses) can trigger hyperthermia, and also lead to kidney and heart failure. Which of the following is a common sign of methamphetamine use?

A. Increased appetite and weight gain Meth typically causes appetite suppression and weight loss. B. Increased heart rate Meth is a potent stimulant, and tachycardia (increased heart rate) is a common and dangerous sign. C. Low energy and decreased reaction times These are signs of depressant use or withdrawal, not stimulant intoxication. D. Increased sleepiness Meth causes insomnia and hyperactivity, not sleepiness.