Card 3 / 34: A 75 year-old woman complains of severe chest pain. A cardiac evaluation is unrevealing. An upper endoscopy shows erythema and linear ulcerations in the distal esophagus. Her only medication is synthroid (thyroid hormone replacement). Which of the following is the most likely explanation for these endoscopic findings?
1.) Caustic injury
2.) Cytomegalovirus infection
3.) Mucosal injury from bile
4.) Mucosal injury from acid
5.) Mucosal injury from a foreign body

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