Fill in the blank (_) in the following sentence from the following choices.
Sentence: To keep her heart pumping, they cracked her chest open and stuck a tube in her. The _ was bloody.

Choice 1: To keep her heart pumping, they cracked her chest open and stuck a tube in her. The chest was bloody.
Choice 2: To keep her heart pumping, they cracked her chest open and stuck a tube in her. The tube was bloody.
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
1
2.