In this task your given two statements in Indonesian. You must judge whether the second sentence is the cause or effect of the first one. Label the instances as "cause" or "effect" based on your judgment. The sentences are separated by a newline character.

Let me give you an example: Barang itu dikemas dalam bungkus gelembung.
Barang itu rapuh.
The answer to this example can be: cause
Here is why: The object being delicate is the cause of wrapping it in bubble wrap.

OK. solve this:
Pria itu menjalani operasi darurat.
Dia menderita serangan jantung.
Answer:
cause