Fill in the blank (_) in the following sentence from the following choices.
Sentence: Jennifer asked Mary for help understanding the diagnosis given by the doctor because _ had a lot of medical training.

Choice 1: Jennifer asked Mary for help understanding the diagnosis given by the doctor because Jennifer had a lot of medical training.
Choice 2: Jennifer asked Mary for help understanding the diagnosis given by the doctor because Mary had a lot of medical training.
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
2
2.