Please answer the following question: Question: Who pushes Tom to question Summer about their relationship? If there is no answer, please output "Insufficient information to provide an answer.". Movie title: (500) Days of Summer Context: The film is presented in a nonlinear narrative, jumping between various days within the 500 days of Tom and Summer's relationship. This is a linear summary of the plot. On January 8, Tom Hansen meets Summer Finn, his boss's new assistant. Tom is trained as an architect but works as a writer at a greeting card company in Los Angeles. After discovering they have a similar taste in music, they have a conversation about the legitimacy of love, something Tom believes in but Summer does not. Following a karaoke night, Tom's friend and co-worker McKenzie drunkly reveals that Tom likes Summer, which Tom asserts is only "as friends", something Summer agrees to. Despite this, a few days later, Summer kisses Tom in private at work. During the next few months Summer and Tom grow closer, despite Summer telling him that she does not believe in true love and does not want a boyfriend. Tom shows Summer his favorite spot in the city, which overlooks a number of buildings he likes, although the view is spoiled by parking lots. After several months of dating, both Tom's friends and Rachel push Tom to question Summer where they are in their relationship, though Summer brushes this off, saying that it shouldn't matter if they're both happy. One night, Tom gets into a fight with a man who flirts with Summer, and Tom and Summer have their first argument. Though they rekindle, Summer is unable to offer stability or to "put a label" on their relationship. On day 290, Summer breaks it off with Tom after an awkward conversation in the record store, where Summer appears disinterested in Tom. Despite Summer asserting Tom is still her best friend, he does not take the breakup well, and his friends call his younger sister, Rachel, to calm him down. Summer quits her job at the greeting card company. Tom's boss moves him to the consolations department, as his depression is not suitable for happier events. Tom attends a blind date with a woman named Alison. The date does not go well, as he spends it complaining about Summer, though Alison...
A:
Tom's friends and Rachel.