Depends on what you're talking about. In fetus development?
i think i might be wrong but it might be A.irony/sarcasm
<span>The context will often determine how much needs to be brought up.</span>
Tell me about it later, I’m busy right now. :)
A child said What is the grass? fetching it to me with full hands;
How could I answer the child? I do not know what it is any more than he.
I guess it must be the flag of my disposition, out of hopeful green stuff woven.
Or I guess it is the handkerchief of the Lord,
A scented gift and remembrancer designedly dropt,
Bearing the owner's name someway in the corners, that we may see and remark, and say Whose?