Which one of the following is the main reason of 70% of all the kidney stones?

Which one of the following is the main reason of 70% of all the kidney stones?

گردے کے تمام پتھروں میں سے %70 کی بنیادی وجہ درج ذیل میں سے کون سا ہے؟
Explanation

Calcium oxalate accounts for ~70% of kidney stones, forming crystals when urine is concentrated.

It results from high oxalate intake (e.g., spinach, nuts) or metabolic imbalances.