<prompt>  The parents of an 8-yr old boy complained of frequent severe bleeding on minor traumaWhen they consulted a dentist for a decayed tooth, he advised for checking of prothrombin time PT and plasma thromboplastin time PTT, which would be as followsPT is normal, PTT is normalPT is prolonged, PTT is prolongedPT is normal, PTT is prolongedPT is prolonged, PTT is normal 