A scientist studied two semen samples Aand B and found that sample A lacked fructose while sampleB lacked citric acid . What could be the reason

Fructose provides energy and citric acid maintains the ph. If sample A lacked fructose then the person whose semen it is, is infertile. And if sample B lacked citric acid then the person whose semen sample is B is also infertile. That is why these samples lack fructose and citric acid.