You need to answer a given question containing a blank (_). Your answer must be one of the two objects mentioned in the question, for example "trophy" and "suitcase". Your answer must not contain a word that is not present in the question. Please don't use articles (e.g., the, a) before the answer.

I used a battery to take pictures with the camera and put them in an album until the _ needed charging.
battery

The computer was stumped by the algorithm but solved the equation with ease, as the _ was so complex.
algorithm

The conditioner that my mom used was better than the shampoo I used, because the _ was a name brand.

conditioner