Given a scientific passage and an answer, generate a question for the given answer.

Example Input: Passage: Chlamydia is the most common bacterial STI in the U. S. Females are more likely to develop it than males. Symptoms may include burning during urination and a discharge from the vagina or penis. Answer: chlamydia
Example Output: What is the most common bacterial sti in the u. s.?

Example Input: Passage: Mollusks reproduce sexually. Most species have separate male and female sexes. Gametes are released into the mantle cavity. Fertilization may be internal or external, depending on the species. Fertilized eggs develop into larvae. There may be one or more larval stages. Each one is different from the adult stage. Mollusks have a unique larval form called a trochophore . It is a tiny organism with cilia for swimming. Answer: trochophore
Example Output: What is the unique larval form of mollusks called?

Example Input: Passage: Motion of water molecules helps break up interactions between solid ions or molecules. Answer: solid ions or molecules
Example Output:
Motion of water molecules helps break up interactions between what?