When the pituitary gland produces too much growth hormone in an adult, what condition occurs?

C. Acromegaly
Think of excess growth occurring, and associate that with “mega”.

Agree with the first poster. Andre the Giant (wrestler) has it.
Here is a pic if you are interested in what that looks like.
http://www.andrethegiant.com/bio.html

C

C, acromegaly. Results in enlargement of the hands, feet, jaw and some facial features.

c.
http://www.acromegaly.org/