What is the most common type of gallstone?

What is the most common type of gallstone? Correct Answer cholesterol stones

Gallstones are crystalline substances embedded in a small amount of protein material formed most often in the gallbladder. The most common type of gallstone consists principally of cholesterol.

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Regarding gallstone
Consider the following grammar (that admits a series of declarations, followed by expressions) and the associated syntax directed translation (SDT) actions, given as pseudo-code: P → D* E* D → int ID {record that ID.lexeme is of type int} D → bool ID { record that ID.lexeme is of type bool} E → E1 + E2 {check that E1.type = E2.type = int; set E.type := int} E → !E1 {check that E1.type = bool; set E.type := bool} E → ID {set E.type := int} With respect to the above grammar; which one of the following choices is correct?