i have consulted it books and medical students
(body ko energy muhaya krny ka major source optimum energy intke ha,basal metabolism ka mtlb hota ha todd phod kr dena,is k 2 process hain,,1 anabolism and 2 catabolism , smaller molecules are converted into larger molecule and in catabolism larger molecules are broken down into smaller molecule,and in question there is no such thing)
so pls answer is monosachhride according to my opinion