This task is about writing a correct answer for the reading comprehension task. Based on the information provided in a given passage, you should identify the shortest continuous text span from the passage that serves as an answer to the given question. Avoid answers that are incorrect or provides incomplete justification for the question.

Passage: Antibiotics are screened for any negative effects on humans or other mammals before approval for clinical use, and are usually considered safe and most are well tolerated. However, some antibiotics have been associated with a range of adverse side effects. Side-effects range from mild to very serious depending on the antibiotics used, the microbial organisms targeted, and the individual patient. Side effects may reflect the pharmacological or toxicological properties of the antibiotic or may involve hypersensitivity reactions or anaphylaxis. Safety profiles of newer drugs are often not as well established as for those that have a long history of use. Adverse effects range from fever and nausea to major allergic reactions, including photodermatitis and anaphylaxis. Common side-effects include diarrhea, resulting from disruption of the species composition in the intestinal flora, resulting, for example, in overgrowth of pathogenic bacteria, such as Clostridium difficile. Antibacterials can also affect the vaginal flora, and may lead to overgrowth of yeast species of the genus Candida in the vulvo-vaginal area. Additional side-effects can result from interaction with other drugs, such as elevated risk of tendon damage from administration of a quinolone antibiotic with a systemic corticosteroid. Some scientists have hypothesized that the indiscriminate use of antibiotics alter the host microbiota and this has been associated with chronic disease. Question: What is one possible serious side effect of over-using antibiotics?
alter the host microbiota

Passage: The independence of the ECB is instrumental in maintaining price stability. Not only must the bank not seek influence, but EU institutions and national governments are bound by the treaties to respect the ECB's independence. To offer some accountability, the ECB is bound to publish reports on its activities and has to address its annual report to the European Parliament, the European Commission, the Council of the European Union and the European Council. The European Parliament also gets to question and then issue its opinion on candidates to the executive board. Question: Why do EU institutions and national governments have to respect the independence of the ECB?
bound by the treaties

Passage: Some commentators have defined reverse discrimination as a policy or practice in which members of a majority are discriminated against in favor of a historically disadvantaged group or minority.[non-primary source needed] Many argue that reverse discrimination results from affirmative action policies and that these policies are just another form of discrimination no different from examples in the past. People like Ward Connerly assert that affirmative action requires the very discrimination it is seeking to eliminate. According to these opponents, this contradiction might make affirmative action counter-productive. One argument for reverse discrimination is the idea that affirmative action encourages mediocrity and incompetence. Job positions would not be offered to the applicants who are the most qualified, but to applicants with a special trait such as a certain race, ethnicity, or gender. For example, opponents say affirmative action causes unprepared applicants to be accepted in highly demanding educational institutions or jobs which result in eventual failure (see, for example, Richard Sander's study of affirmative action in Law School, bar exam and eventual performance at law firms). Other opponents say that affirmative action lowers the bar and so denies those who strive for excellence on their own merit and the sense of real achievement. Opponents of affirmative action suggest that merit should be the primary factor considered in applying for job positions, college, graduate school, etc. Question: An argument against affirmative action is that it encourages what?

mediocrity and incompetence