You should let them know that you don't know but that you will find out as soon as possible and give them an answer. Ask your up-line, ask your A2A friends or visit the forums or see if you can find the answer on the FAQs page. You can teach them also how to look for the answer. That way the can learn how to look up the answer for their questions. and if the answer is not found or they are not satisfied you can always ask Gery.