1. A method for use by a system having a processor for administering an audio challenge for providing human response verification, the method comprising: receiving a request to verify whether a client is human controlled; generating, by the processor, using a database, a challenge question and a corresponding answer set, wherein the challenge question includes identifying a sound audible in an audio clip by having the client count a number of times the sound is audible in the audio clip; selecting the audio clip corresponding to the challenge question; selecting an audio instruction from a plurality of stored audio instructions corresponding to the challenge question; presenting the audio clip and the audio instruction to the client; receiving a submission to the challenge question from the client, wherein the submission includes the number of times the sound is audible in the audio clip; and responding to the request by verifying whether the submission is contained in the answer set to determine whether the client is human controlled.