The phrase 'which is relevant to' is correct and can be used in written English.
Example: The new data, which is relevant to the study, was collected last week.
This is a national crisis, which is relevant to each of us irrespective of our current age.
Of course any evidence obtained which is relevant to allegations of criminal activity will be forwarded to Greater Manchester police".
The gas mixture studied is hydrogen/methane, which is relevant to hydrogen purification in refineries.
Integrin-linked kinase, which is relevant to neoplastic transformation, is highly expressed in malignant pleural mesothelioma.
Gamow Teller (GT) transitions are an important feature of radioactive beta decay, which is relevant to many astrophysical processes.
Students of almost any discipline can find something in philosophy which is relevant to their own specialties.
But Koedt pointed out something else which is relevant to the recurrent cultural fascination with the G-spot.
We're very careful not to make this into a political issue: it is something which is relevant to everybody," said Gardner.
"Pierre has spearheaded collaborations with his peers in other disciplines, which is relevant to what's happening today," said Nancy Spector, curator of contemporary art at the Guggenheim.
The influence factors of which is relevant to cooling water tank temperature, containment pressure and system input power.
In Malaysia, SDS has been great potential to be used in drying purpose, which is relevant to the local climate.
