I Intensive insecticide fogging has been ordered in all the wards of the city by the municipal corporation. II Dengue can now be prevented by a vaccine developed by the Immunology Institute of India.

• If I is the immediate cause and II is its effect.
• If II is the immediate cause and I is its effect.
• If I is the effect but II is not its direct/immediate cause.
• If II is the effect but I is not its direct/immediate cause.