How to remove Duplicate rows retain latest LastDrugPickup

Question

Dear Code masters,

I believe this mail meet you all in good health, i am writting an SQL script that will generate all patient and their most current LastDrugPickupDate. my script is as below

SELECT Distinct a.Ptn_Pk, a.PatientEnrollmentID AS PatientID,
 CONVERT(datetime, a.ARTStartDate, 103) AS ARTStartDate, CONVERT(datetime, c.DispensedByDate, 103) AS LastDrugPickup
 ,b.Duration,b.RegimenType, c.RegimenLine FROM dbo.VW_PatientDetail AS a left JOIN
 dbo.VW_PatientPharmacy AS b ON a.Ptn_Pk = b.Ptn_pk left JOIN
 dbo.ord_PatientPharmacyOrder AS c ON  b.ptn_pk = c.ptn_pk
 WHERE a.ARTStartDate IS NOT NULL And b.RegimenType is not NULL
 ORDER BY c.DispensedByDate desc

 the result is show below with alot of duplicate rows:

 

Please how can i remove the duplicate rows but retaining the most current LastDrugPickDate looking at the yellow shaded records.

 

thank you