Samajwadi Party chief Akhilesh Yadav's wife Dimple Yadav will contest from Uttar Pradesh's Mainpuri seat which has been left vacant following the demise of Mulayam Singh Yadav on October 10. The Election Commission had announced last week that bypolls for the Lok Sabha constituency will be held on December 5. Dimple has served as a Lok Sabha MP twice.