Question: What election did Varaprasad Rao Velagapalli win to constitute the 16th Lok Sabha, electing members of parliament for all 543 parliamentary constituencies of India?  
Sentence (from "Varaprasad Rao Velagapalli"): Varaprasad Rao Velagapalli is an Indian politician and a member of parliament to the 16th Lok Sabha from Tirupati (Lok Sabha constituency), Andhra Pradesh.
Relevant evidence: No