Needs["FeynCalc`"]

Use commuting scheme for dealing with (γ^5) in D dimensions

$Larin=True;
$West=False;
$BreitMaison=False;

Define on-shell momenta and scalar products

SP[k,k]=0;
SP[p,p]=M^2;
SP[p,k]=M ^2r/2;

Numerators

line1=(GSD[l]+m).GAD[μ].(GSD[l]+GSD[p]-GSD[k]+m).GAD[ν].(GSD[l]+GSD[p]+m)

line2=(GSD[l]+m).GAD[ν].(GSD[l]+GSD[k]+m).GAD[μ].(GSD[l]+GSD[p]+m)

Denominators

denom1=FeynAmpDenominator[PropagatorDenominator[l,m],PropagatorDenominator[l+p-k,m],PropagatorDenominator[l+p,m]]

denom2=FeynAmpDenominator[PropagatorDenominator[l,m],PropagatorDenominator[l+k,m],PropagatorDenominator[l+p,m]]

numO5open1=GAD[α].GAD[β].GAD[γ].(1-GA[5]).line1.GAD[α].GAD[β].GAD[γ];

numO5open2=GAD[α].GAD[β].GAD[γ].(1-GA[5]).line2.GAD[α].GAD[β].GAD[γ];

OneLoop[l,numO5open1 denom1+numO5open2 denom2]