Tokyo (CNN) The Education Minister of Japan has condemned gender discrimination following reports that Tokyo Medical University allegedly rigged entrance exam scores to lower the ratio of female students.

"We are asking (Tokyo Medical University) to investigate and report as soon as possible how entrance exams have been practiced and if it has been properly done," Minister Yoshimasa Hayashi said in a press conference on Friday.

"We will wait for their report and consider how we respond. In general, unjust discriminatory selection of entrants for women is totally unacceptable."

Japan's Education Minister Yoshimasa Hayashi at a press conference in April.

Local newspaper Yomiuri Shimbun first reported on Thursday that the university had allegedly lowered female scores since 2011. An unnamed university source claimed the alleged practice stemmed from a belief that female doctors would leave the profession to get married or give birth, leaving hospitals understaffed.

In 2010, 40% of successful applicants were women, according to the Yomiuri Shimbun. Under the alleged rigging, the number dropped to around 30%, the unnamed source told the newspaper. It dipped even lower this year -- women made up 39% of total applicants, but of the students who passed, only 18% were women, according to Tokyo Medical University.

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