First, Saeviomagy was not being passive aggressive he was being facetious. See the smiley? Secondly, Jack99 answered your question with a rules quote. Be careful, however, not to fall into the halting problem trap. If there's no rule granting you something doesn't mean that you are allowed that something if there's also no rule disallowing it. As an analogy, consider that nothing says that you are due an orange soda prior to your first action. But, do you really think you get one? So, as Saeviomagy points out, nothing says you don't get the OA so therefore things function as normal (default setting as Jack99 points out). Besides certain conditions, the only thing about rounds that disallows OA's is the surprise round.
So to clarify...
I do not have all three PHBs, the DMG, and various splat books memorized, I haven't had the time to do so like I did in 3e.
So I was asking
if there was a rule regarding that particular situation, with the hope that someone either knew of one, of knew there was not.
An answer such as "There is no such rule." would suffice.
I asked for page numbers so that,
if it existed I had the actual rule to discuss with my DM, since I don't think "Someone on EN World said so." is a good enough standard to ask your DM to go by.
Saying "I suppose I could show you where it isn't? Every page of all the rulebooks released to date
" is just being a putz, emoticons don't negate what you write.
If you walked up to me on the street and said "Is the a pay phone near here you could point me to?"
Which response would be appropriate if there were none:
"Sorry, there are none around here."
-or-
"Should I point out every street corner that doesn't have one in the whole city?
"