Dr. Stein suspects that his patient, Alex, is suffering from myasthenia gravis. To confirm his suspicions, Dr. Stein gives Alex a low dose of a certain drug through an intravenous injection and then monitors his condition. Within the first few minutes, Dr. Stein observes an immediate increase in muscle strength. The effects of the drug last for about 30 minutes and then subside. The results confirm that Alex is suffering from myasthenia gravis. Based on the information provided in this scenario, which of the following drugs has Dr. Stein used to diagnose Alex's condition?
A. Atropine
B. Echothiophate
C. Edrophonium
D. Pralidoxime
Answer: C
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