Mahabharata 12.285.1

जनक उवाच · janaka uvāca

वर्णो विशेषवर्णानां महर्षे केन जायतेएतदिच्छाम्यहं श्रोतुं तद्ब्रूहि वदतां वर

varṇo viśeṣavarṇānāṃ maharṣe kena jāyateetadicchāmyahaṃ śrotuṃ tadbrūhi vadatāṃ vara

Our plain-language meaning of this verse is waiting for scholar review.