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: We did complete histologic study on 148 gravid tubes and found that nearly 90% showed chronic lesions. CS was the most frequent lesion encountered (95.5%), followed by SIN (32.6%). Most frequently the lesions were extensive and both the ampulla and isthmus were involved. We therefore question the conservative approach in the treatment of certain TPs. 
 Which is the apt title for the abstract? option1: Tubal causes of ectopic pregnancy. option2: AAMC longitudinal study of 1960 medical school graduates: a 20-year effort in 28 schools, 1956-1976 [editorial]
Output:
Tubal causes of ectopic pregnancy.