Why stomach produce only HCl as a acid not others

Dear student
Please find below the solution to the asked query

Stomach produces only HCl and not other acids because of various reasons and these may be:

1. Easy availability of hydrogen and chlorine ions in food.
2. Less toxicity of chlorine ions than ions like sulphur, ammonia, nitrates etc. 
3. HCl is stronger acid than some common acids that helps to activate pepsinogen.
4. Less complex processes required in the formation of HCl than other acids.

Hope this information will clear your doubts about the topic.
Regards