Dua When Someone Sneezes

"If anyone of you sneezes, he should say:
الحَمْدُ للهِ
'Alhamdulillah'
(Praise be to Allah.)
And his (Muslim) brother or companion should say to him:
يَرْحَمُكَ اللَّهُ
'Yarhamukallah'
(May Allah bestow his Mercy on you.)
When the latter says 'Yarhamukallah', the former should say,