Definition: Given an abstract, indicate which of the provided candidate titles (Option1 and Option2) best describes it (respond with the text of the title, not option1/2).
Input: Abstract: In the investigation of children with leg aches, it is essential to identify any underlying organic disease. Growing pain is a poorly named, nebulous entity that can be diagnosed only by exclusion. The greatest diagnostic error is to make a diagnosis of growing pains while overlooking some serious underlying condition. 
 Which is the apt title for the abstract? option1: Growing pains. option2: The multifidus muscle in patients with lumbar disc herniation. A histochemical and morphometric analysis of intraoperative biopsies.
Output:
Growing pains.