Input: who won women's singles at wimbledon 2017?

Output: Garbine Muguruza

Input: why is the synthesis stage (s phase) called synthesis?

Output: DNA replication

Input: who is the actor that plays nate in gossip girl?

Output: Christopher Chace Crawford

Input: where is calcium stored in a muscle cell?

Output:
sarcoplasmic reticulum (SR)