Opener's Rebid after Partner's Negative Double 2

Opener's Rebid after Partner's Negative Double 2

Question:

You are South. Matchpoints. None vul. 

You hold: 

Q1087
AK32
A876
2

What is your next call on this auction:

  West    North    East    South  
   1diamonds icon
1hearts iconDbl Pass?

Answer: