I am using one Macbook Pro with OSX 10.7.5 Lion. Yesterday I was experimenting to install debian 8 in my flash drive. It was successful. I started from holding down option key in my keyboard. Then choose, boot from my flash drive. After installing Debian in my flash drive, I removed it.

Now the problem is everytime I start my laptop. It is showing the following screen. I need to hold down the option key to select Mac HD for entering into my os.

How can I solve this GRUB issue!!!

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