Instructions: 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: Deformities are abnormalities of shape or form caused by abnormal or imbalanced mechanical forces. In prenatal deformation, most infants are intrinsically normal and the deformation results from extrinsic constraining forces. Most prenatal deformities will resolve spontaneously or with the application of counteracting forces. In contrast, postnatal deformities result from either extrinsic pathologic processes, affecting the bones, nervous system, or muscle and resulting in the application of abnormal forces to bone, or normal forces acting on intrinsic diseases of bone. While many postnatal deformities can be contained or corrected by the application of counteracting forces, aggressive physical therapy, casting, or surgery is often required for correction. 
 Which is the apt title for the abstract? option1: The origin of prenatal and postnatal deformities. option2: A concept of illness tested as an improved basis for surgical decisions in low-back disorders.
Output:
The origin of prenatal and postnatal deformities.