Section 40(1)(a) in The Bihar Panchayat Raj Act, 2006
(a)The elected members of the Panchayat Samiti referred to in clause (a) of sub-section (1) of Section 36 shall, as soon as may be, elect two members from among themselves to be the Pramukh and Up-Pramukh respectively of the Panchayat Samiti;