Who are they?

Two girls appeared at the registrar's office of a college. The receptionist handed each of them a questionnaire to fill out. Each girl wrote the following facts on the questionnaire. Each had the last name Smith. Each was born on February 29, 1960. Each was born at 376 East 53rd Street, Mumbai. Each had a father named Rohit Sharma and a mother named Shikha Sharma. When the girls had completed the questionnaires they handed them to the registrar. The registrar read them and asked, "Are you two girls' sisters?". They replied, "Yes, we are." Looking up from his papers, the registrar saw the two girls and noticed that they looked exactly alike. He said, "You're twins, aren't you?". They both promptly answered, "No." Assuming that all the answers they gave were true, and that they had the same mother and father, how do you account for the fact that they were not twins?

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