 तां समीक्ष्य विशालाक्षीमधिकं मलिनां कृशाम्।।तर्कयामास सीतेति कारणैरुपपादिभिः। 
 After seeing the largeeyed lady worn out and dressed in soiled clothes, Hanuman started deliberating in himself and guessed it was Sita for strong reasons. 