Is chillia fruit?

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I know this for sure but want to prove it to a close friend of mine that chilli is a fruit, Oh yes it is........... I was quite startled myself when i heard it from my stepson Mark that this spicy little thing that is so pungent and used ti spice up the food happens to be a fruit.... i debated with him for quite some time until it showed me a clipping in the paper.. But i don't have it anymore and need to prove it... So whoever can agree with me please post your answers and help me sort this issue once and for all.. Thanks guys.........much appreciated*