Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: Lindsay and Jon Hall spent 12 years having 12 rounds of IVF to achieve their dream of three children - but soon after tragedy struck. After spending more than £12,000 on the treatments, Lindsay and Jon Hall, who once feared they might never have children, have finally created their perfect family. When twins Esme and Oliver, now one, finally came along four years after son Taylor, five, it was a dream come true. But their joy was short-lived. Just months after the twins were born, Lindsay found a lump in her breast and she was diagnosed with stage three aggressive breast cancer .Lindsay and Jon Hall from Chesterfield, Derbyshire spent £12,000 on IVFAfter 12 years of treatment, Lindsay, now 33, has three childrenBut she also battled breast cancer, which may have been caused by the IVF 
 Question:'I asked my consultant outright if _ had given me cancer, and he wouldn't answer.

IVF