Would it not also depend on how they respond to stimuli?

I know you wouldn’t multiply exponents that way unless it’s an exponent of an exponent. In any case, it’s the only way I can make the term “mcg” actually make sense.
Think of it as giving someone the benefit of the doubt to the point of absurdity.

Micrograms? You mean millicentigrams, commonly abbreviated as mcg by people who avoid proper SI- symbols?

Since milli means 1/10^3 and centi means 1/10^2, I propose millicenti means 1/10^(3*2) or 1/10^6.

Or the extended keycode-averse could just use ug.

He probably thought he was dealing with Colombia and Taiwan.