Can the property management Committee respond to the lawsuit instead of the industry Committee?

I can't. The external responsibilities of the owners' committee stipulated in the regulations are to select and supervise property companies, cooperate with relevant competent departments to do a good job in social security, and stipulate that they shall not engage in activities unrelated to property management. In fact, this is a regulation on the civil subject qualification of the owners' committee. Since the owners' committee represents the interests of all owners and is elected by the owners' congress, the effectiveness of its actions will be extended to all owners, and the owners' committee will also be responsible for the actions of members in the name of the owners' committee according to the principle of agency by estoppel.