options: f : it 's ok. i just want to talk about my son 's performance with mr. smith . f : fine . i just want to talk about my son 's performance with mrs. smith . f : it 's ok. i just want to talk about my performance with mr. smith . f : fine . i am calling to ask some chemistry questions to mr. smith .
article: f : hello . is this mr. smith 's office and the chemistry department ? m : yes , it is . can i help you ? f : yes , i am the mother of a student in his class . i want to talk with mr. smith about my son 's performance . is mr. smith in ? m : no , he 's having class at the moment .