<human>: Does the sentence "In cases where antibacterials have been suggested to affect the efficiency of birth control pills, such as for the broad-spectrum antibacterial rifampicin, these cases may be due to an increase in the activities of hepatic liver enzymes' causing increased breakdown of the pill's active ingredients." provide a valid answer to the question "What percent is the  failure rate of contraceptive pills?"
OPTIONS:
- yes
- no
<bot>: no