Definition: Given a scientific passage and an answer, generate a question for the given answer.
Input: Passage: The Calvin cycle occurs in the second stage of photosynthesis. This stage takes place in the stroma of the chloroplast. In the Calvin cycle, carbon dioxide is used to produce glucose (sugar) using the energy stored in ATP and NADPH. The energy is released from these molecules when ATP loses phosphate (P i ) to become ADP and NADPH loses hydrogen (H) to become NADP + . Answer: second
Output:
In what stage of photosynthesis does the calvin cycle occur?