Why Apple Use Objective -C ?

After a short time of development in Objective -c, I am bit confused why apple use objective-c as their first class language ? why they are not using c#, .net, php, python or java ? Guys any idea about it ? After a small research in all langues what i meant above, i found that Objective-C is

• Sophisticated Object oriented Programming Language.
• Small but Powerful Language set of extensions to the slandered object oriented language .
•  Designed to give a “C” full object oriented programming capabilities.
• Objective-c is very dynamic, compared to other  object oriented programming languages based on C.
•  Unusual flexibility and power.
• Supports an open style of dynamic binding.
• It also help to build sophisticated development tools.

Can you share me if you find anything more ?

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