**Core Concept**
Indirect pulp capping procedures are a type of dental treatment used to manage deep caries lesions in primary teeth, aiming to preserve the remaining tooth structure and prevent further pulp exposure.

**Why the Correct Answer is Right**
Indirect pulp capping is indicated in primary molars when the dentist is close to but has not yet penetrated the pulp. This procedure involves placing a medicated dressing over the area to promote the formation of secondary dentin and prevent bacterial invasion. The medicated dressing helps to stimulate the formation of secondary dentin, which can provide additional protection to the pulp.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because direct pulp capping is indicated when the dentist has already exposed the pulp, whereas indirect pulp capping is used when the dentist is close to the pulp but has not yet exposed it.

**Option B:** This option is incorrect because pulpotomy is a more extensive procedure used to remove a portion of the pulp, which is not indicated when the dentist is close to but has not yet penetrated the pulp.

**Option C:** This option is incorrect because root canal therapy is indicated when the pulp is irreversibly damaged and the tooth cannot be saved with pulp capping or pulpotomy.

**Option D:** This option is incorrect because extraction is usually the last resort and is not indicated when the dentist is close to but has not yet penetrated the pulp.

**Clinical Pearl / High-Yield Fact**
When performing indirect pulp capping, it's essential to use a medicated dressing that contains calcium hydroxide or mineral trioxide aggregate (MTA), as these materials promote the formation of secondary dentin and provide an antibacterial effect.

**Correct Answer: A. Indirect pulp capping is indicated when the dentist is close to but has not yet penetrated the pulp, making it a suitable procedure for managing deep caries lesions in primary molars.**