Pentose sugar has 5 carbon atoms if that's what your asking..!(:
The "d" in dTMP stands for "deoxy-". This refers to the sugar, which is deoxyribose.
I'm almost certain the answer is ribose and dioxiribose
ribose
It has 5 carbon atoms therefore is called a 'pen'tose. Same thing with glucose - that has 6 carbons and so is called a 'hex'ose sugar.